Saying it won’t gain any power is like saying a runner won’t run any slower with a mask over his face.
@dillanthomas-seiler9067
3 ай бұрын
It can gain upto 10+ hp depends on the car’s condition, seen videos of proof of power gains
@vanmann8347
5 ай бұрын
Here’s a man who’s so busy, that he has to make a video while driving.
@MrCxiong116
5 ай бұрын
It may not add a lot more power but the high rpm sure does feel stronger pull with cat delete especially with turbo engines. You can even hear the turbo spool up quicker too.
@damemphisricer2808
4 ай бұрын
If you live in a area or state that doesn't have emissions, deleting catalytic converter is a money saver, don't have to worry about replacing in the future if it clogs from misfires and everything, the exhaust stays freely flowing without spending money on catalytic converter and have and exhaust shop to charge you a arm and a leg to weld it on....
@g14potato74
9 ай бұрын
It's ok to be wrong...
@mikezaverin
9 ай бұрын
It’s also ok to know a difference between small and big displacement engines and Dyno results
@RollingRoadEFI
4 ай бұрын
@@mikezaverin You know you could've just admitted you were wrong.... but instead you proceeded to double down with arrogant cringe. Lol Smh.
@jgetscensored7837
3 ай бұрын
@@mikezaverinlol. What’s the displacement have to do with it? Please explain the science?
@SnackyPaper
9 ай бұрын
I disagree, on 9th gen v6 accord the gains are pretty big when deleting cats, upwards of 20whp and around 13 whp with high flow. This may just be because the factory cats are really restrictive, but even on newer turbo Hondas if you want to make more hp you have to delete the cat pretty early on.
@mikezaverin
9 ай бұрын
That’s correct for smaller displacement engines to a certain degree.
@hondaservicecenter
8 ай бұрын
Only with a tune
@isnowyazn
7 ай бұрын
@@hondaservicecenterFor the most optimal gains, yes. I still believe you will gain a bit, depending on the bigger the displacement of the engine. People are also talking about backpressure, but unless you’re running open headers (downpipes) or running no (catback) exhaust system at all (open j-pipe), you won’t notice any huge, proper gains, and the engine will run like crap.
@isnowyazn
7 ай бұрын
I actually found that gutted pre-cats adjusted the torque and power curve all the way towards the higher end of the power band. Most of the gains were usually best when lower VTEC was set to begin engaging around 4300. With the high flow catted downpipes or a catted j-pipe, it usually helped with mid range power, mostly. I found that running gutted pre-cats usually needed to have all afterwards cats deleted (not gutted), in order to see optimal high end power band gains. Gutted cats are usually only done with OEM cats or generic replacement cats, unless you’re rich and can destroy some brand name high flow cats. There are cheap cats you can have welded on, in place of the stock cats, if you wish to go that route. But depending where you live, finding salvaged used cats (have to have a loophole these days now) is the best way to go if you want to run the larger diameter gutted shell for this particular power band gain. I personally run RV6 PCD’s w/ a catted ATLP V2 j-pipe for my daily (J35Y1, 6AT) V6 EX-L coupe. But on my J35Y2 (6MT) EX-L coupe, it’s a full NA build, currently taking out the stock cams to have Halferland cut me a custom cam. I also need to finish the rest of my fuel rail and fuel line upgrades, with P2R parts, as well as getting a new upgraded fuel pump, to be able to run E85 on my OEM Acura RDX injector upgrade. That’s really about it, as I don’t really plan to boost the car, as I’m investing money right now primarily into swapping in the stock LSD 6MT from a 07-08 TL-S (J35A8), or to just build my stock 6MT (J35Y2) with the LSD unit from the TL-S trans. Planning to get carbon lined synchronizers and maybe overhaul what I can in the stock trans, if it comes down to building that. I see a 4th gear shaft brace, but that looks like it’s mostly for 400+ WHP applications.
@Smokey5ohh
2 ай бұрын
@@mikezaverinfor my Mustang cat delete added more whp think your wrong there buddy 😂
@robertprice9052
Ай бұрын
Ok, I’ve been a working on cars since I was a kid in the 70s, and also happen to be an engineer - he’s wrong. Here’s how: ok consider an engineer makes X horsepower. The factory drops it in a car and then starts bolting on accessories like Water pump, AC, manifolds, cats, and mufflers. Everything that impedes the free operation of the motor creates parasitic drag or reduction in efficiency. So, take a car and remove all the things that create drag, or reduces it you recoup the power it took. Look at exhaust of a car; pull the factory exhaust and put on headers, delete the cars, low restriction mufflers and larger pipes will give you back a lot of the power taken from the restrictive system. Look at a catalytic converter’s insides and intuitively you will know it restricts the flow. As for the eye burning exhaust gasses; I would submit that his car was out of tune and too much unburned fuel was in the exhaust system. Could be his ignition system, timing, or not enough compression to burn high octane fuel. Bottom line he’s wrong, and he’s wrong for making videos while driving.
@mikezaverin
Ай бұрын
You obviously never ran header and cat deleted car on 93 octane. It does smell like crap. Engine Belt driven accessories will take some power out for sure. Lastly, I am an engineer myself but what kind of an engineer are you? In most cases good flying cats won’t make that much of a difference and boosted vehicles is another story. Try a fish bone to solve that problem.
@sir.636
Ай бұрын
@@mikezaverinyou are a terrible engineer then
@erxfav3197
13 күн бұрын
@@sir.636why
@isnowyazn
7 ай бұрын
I have an LS3, so unless you have a 04-06 C6 Corvette, then you might not see the same exact gains, but an LS2 engine should somewhat still work in a similar way (drive-by-wire throttle mapping). I guarantee that if you and I were to either get long tube headers and maybe add high flow cats or not, we would be seeing similar gains without a tune, on an all stock engine setup.
@mikezaverin
7 ай бұрын
You would need a tune regardless
@RollingRoadEFI
4 ай бұрын
@@mikezaverin Not true either lol
@brugley1090
Жыл бұрын
incorrect, it may not add a lot of power but it is one less blockage in the pipe to have the exhaust gas escape efficiency.
@mikezaverin
Жыл бұрын
That is incorrect, if you have headers it might do something but it’s there for emission control. Remember you still need proper back pressure and deleted cats won’t do a thing
@johnwaldie4113
Жыл бұрын
@@mikezaverin back pressure ok ..you are wrong .
@johnwaldie4113
Жыл бұрын
One of the most misunderstood concepts in exhaust theory is backpressure. People love to talk about backpressure on message boards with no real understanding of what it is and what it's consequences are. I'm sure many of you have heard or read the phrase "Hondas need backpressure" when discussing exhaust upgrades. That phrase is in fact completely inaccurate and a wholly misguided notion. II. Some basic exhaust theory Your exhaust system is designed to evacuate gases from the combustion chamber quickly and efficently. Exhaust gases are not produced in a smooth stream; exhaust gases originate in pulses. A 4 cylinder motor will have 4 distinct pulses per complete engine cycle, a 6 cylinder has 6 pules and so on. The more pulses that are produced, the more continuous the exhaust flow. Backpressure can be loosely defined as the resistance to positive flow - in this case, the resistance to positive flow of the exhaust stream. III. Backpressure and velocity Some people operate under the misguided notion that wider pipes are more effective at clearing the combustion chamber than narrower pipes. It's not hard to see how this misconception is appealing - wider pipes have the capability to flow more than narrower pipes. So if they have the ability to flow more, why isn't "wider is better" a good rule of thumb for exhaust upgrading? In a word - VELOCITY. I'm sure that all of you have at one time used a garden hose w/o a spray nozzle on it. If you let the water just run unrestricted out of the house it flows at a rather slow rate. However, if you take your finger and cover part of the opening, the water will flow out at a much much faster rate. The astute exhaust designer knows that you must balance flow capacity with velocity. You want the exhaust gases to exit the chamber and speed along at the highest velocity possible - you want a FAST exhaust stream. If you have two exhaust pulses of equal volume, one in a 2" pipe and one in a 3" pipe, the pulse in the 2" pipe will be traveling considerably FASTER than the pulse in the 3" pipe. While it is true that the narrower the pipe, the higher the velocity of the exiting gases, you want make sure the pipe is wide enough so that there is as little backpressure as possible while maintaining suitable exhaust gas velocity. Backpressure in it's most extreme form can lead to reversion of the exhaust stream - that is to say the exhaust flows backwards, which is not good. The trick is to have a pipe that that is as narrow as possible while having as close to zero backpressure as possible at the RPM range you want your power band to be located at. Exhaust pipe diameters are best suited to a particular RPM range. A smaller pipe diameter will produce higher exhaust velocities at a lower RPM but create unacceptably high amounts of backpressure at high rpm. Thus if your powerband is located 2-3000 RPM you'd want a narrower pipe than if your powerband is located at 8-9000RPM. Many engineers try to work around the RPM specific nature of pipe diameters by using setups that are capable of creating a similar effect as a change in pipe diameter on the fly. The most advanced is Ferrari's which consists of two exhaust paths after the header - at low RPM only one path is open to maintain exhaust velocity, but as RPM climbs and exhaust volume increases, the second path is opened to curb backpressure - since there is greater exhaust volume there is no loss in flow velocity. BMW and Nissan use a simpler and less effective method - there is a single exhaust path to the muffler; the muffler has two paths; one path is closed at low RPM but both are open at high RPM. IV. So how did this myth come to be? I often wonder how the myth "Hondas need backpressure" came to be. Mostly I believe it is a misunderstanding of what is going on with the exhaust stream as pipe diameters change. For instance, someone with a civic decides he's going to uprade his exhaust with a 3" diameter piping. Once it's installed the owner notices that he seems to have lost a good bit of power throughout the powerband. He makes the connections in the following manner: "My wider exhaust eliminated all backpressure but I lost power, therefore the motor must need some backpressure in order to make power." What he did not realize is that he killed off all his flow velocity by using such a ridiculously wide pipe. It would have been possible for him to achieve close to zero backpressure with a much narrower pipe - in that way he would not have lost all his flow velocity. V. So why is exhaust velocity so important? The faster an exhaust pulse moves, the better it can scavenge out all of the spent gasses during valve overlap. The guiding principles of exhaust pulse scavenging are a bit beyond the scope of this doc but the general idea is a fast moving pulse creates a low pressure area behind it. This low pressure area acts as a vacuum and draws along the air behind it. A similar example would be a vehicle traveling at a high rate of speed on a dusty road. There is a low pressure area immediately behind the moving vehicle - dust particles get sucked into this low pressure area causing it to collect on the back of the vehicle. This effect is most noticeable on vans and hatchbacks which tend to create large trailing low pressure areas - giving rise to the numerous "wash me please" messages written in the thickly collected dust on the rear door(s). VI. Conclusion. SO it turns out that Hondas don't need backpressure, they need as high a flow velocity as possible with as little backpressure as possible. Turbo Exhaust Systems: Some of you asked for a better explanation about restriction in a turbo exhaust, so here 'goes. To sum it all up, on a turbo car, the tighter and more restricted the exhaust housing of the turbo is, the faster you're going to spool your turbo... because the restricted gasses escape through the exhaust housing with more velocity (much like the garden hose description quoted above)... but with this restriction comes the downside. Less exhaust volume will be able to fit through that turbine housing once the turbo is spooled and starts squishing more air through the intake. This is where the wastegate comes into play. The wastegate is actuated BEFORE the exhaust wheel in the exhaust housing. When it opens, whatever the diameter of your wastegate is gets added to your exhaust piping. Effectively increasing the capacity of the exhaust provided that everything downstream is large enough in diameter to handle it the extra flow. The main reason it does this is to prevent over-spooling the turbo. Once the turbo reaches its efficiency, it doesn't need to flow all the extra gasses through the turbine wheel, so the wastegate allows you to route the exhaust around the turbo... if it can't route enough exhaust around the turbo (restricted wastegate) then too much exhaust gas will be forced by the exhaust wheel and BOOST CREEP will occur as your turbo over-spools. One way to prevent boost creep is to port the wastegate housing (if you have an internally gated turbo) or to replace the wastegate with a bigger unit. If that still doesn't work, then the problem is likely going to be a restriction in the exhaust downstream from the wastegate. Many overboosted car owners prefer to vent their wastegate dumps to the atmosphere. Not only is it illegal to bypass your catalytic converter, but it's loud as hell, gets your engine bay filthy, and clogs up your K&N like nobody's business; however, it nearly eliminates boost creep. It's a cheap and easy solution that fixes boost creep on a race car. The best solution to boost creep is to route your wastegate dump past the catalytic converter and back into the exhaust. It will be a custom setup. Nobody makes this. Make it look clean and you'll pass emissions because they don't run your car hard enough to open the wastegate when doing emissions testing. You have to reach full boost for the wastegate to open, and since the exhaust runs through the cat until the wastegate opens, it all gets "cleaned" before it reaches the sniffer. With this setup, the wastegate will also be much quieter because it still runs through the muffler, and you won't trash your engine bay with black caustic funk. Putting a separate catalytic converter on your wastegate dump is a stupid idea because you'll never get it hot enough to "light off" and start converting the carbon monoxide... so don't get any crazy ideas and create unnecessary exhaust restrictions. Once compressed air comes into the mix with an engine, exhaust tuning has much less to do with making power. So what if you can milk another 3-5 hp out of a car with a tuned exhaust... the benefits of making an engine sustain an insane final compression ratio (boosted air x compression in the combustion chamber) has much more affect on making power if you can just get rid of the extra gasses it produces. Bigger is almost always better on a turbo setup. The only place where it isn't good is on the exhaust wheel where too big can = no chance of spooling your
@dylanwallace5571
11 ай бұрын
@@johnwaldie4113 holy shit you just decided war on that dude
@talpsisunfunny
9 ай бұрын
@@johnwaldie4113ALR ALR POP OFF MY GUY💀🔥🔥🔥
@Hdfire55
9 ай бұрын
Gotta be more specific you take your cats off with a compliment of bolt ons and a "proper" tune you will. Everything else you said is correct
@truthexposed6151
Күн бұрын
It restricts the flow of exhaust gasses out your engine & causes higher back pressure on bottom end of engine. It's only there to pass the strict emissions testing. I done a de-cat but not all the way the back box (muffler) remains in place. The o2 sensor will throw a check engine light,car will drive better as it's breathing clearly now. I got the engine light coded properly to let the ecu know its doesn't have an o2 sensor. Coding cost me £150. I also, blanked the egr valve both ends, removed egr cooler & gutted the dpf,welded and replaced. The £150 coding covered all this,just a case of pressing some more buttons. In your case tou won't have more power but power will delivered quicker without restriction. You don't know what your talking about pal
@mikezaverin
Күн бұрын
My corvette has headers, cat deletes and axle back, so I know how it works lol
@steelcurtain92
4 ай бұрын
It's about back pressure and whether or not cats are contributing to it. Proper flowing cats shouldn't increase back pressure more than fractionally, if at all.
@Thunderbird1968
7 күн бұрын
Old cars run rich and combust fuel differently too which is why ur eyes burned
@mikezaverin
7 күн бұрын
I have a c6 corvette lmao, 93 octane burning with no cats is not pleasant lmao
@Thunderbird1968
7 күн бұрын
@@mikezaverin I know what you mean
@edyilky6778
Жыл бұрын
It adds power forsure ot does. In my case 18 hp more. Yes also my race motor has 54 hp.more when i deleted cat andnor resonator
@mimic42100
Ай бұрын
high flow cats aren't a thing. cats already have minimal material required. for v8 motors, long tube headers + cat delete = power
@mikezaverin
Ай бұрын
Maybe
@Dropz_RSA
13 күн бұрын
I don’t know why I watch shorts.
@mikezaverin
12 күн бұрын
Because they are so comforting.
@gadget4.016
6 ай бұрын
Yeah this guy doesn't know what he's talking about it definitely adds more power I have a 97 GT I did a CAT delete and I gained about 6 horsepower
@mikezaverin
6 ай бұрын
If you have old cars with restricted manifold, maybe!!!!
@gadget4.016
6 ай бұрын
@mikezaverin I actually have both I have four Mustangs and they all got power gains when I cat deleted them my 14 especially I will admit they do lose torque when you cat delete them but you definitely gain horsepower I hate to say it but you're wrong they definitely gain power and I have the dino sheets to prove it on all four of my Mustangs new and old
@RollingRoadEFI
4 ай бұрын
@@gadget4.016 Bro, dudeman doesn't know what he's talking about and he's doubling down so hard it's ridiculous.
@justinallen169
6 ай бұрын
Did a dump test on a old toyota tacoma pickup 1998. And a lexus is250 07”. Why these cars?. Because that’s what we had at the time. Anyway. Before and after, e picked up about 5-7 and hp/trq w/o cats but still muffled. Not much but maybe another 2-5 more with total straight pipes. Id say 9-10hp is pretty nice without a time to compensate the difference.
@mikezaverin
6 ай бұрын
Dyno?
@willgreen3665
4 ай бұрын
Disagre , any vehicle can gain from not having restrictive exhaust cause every engine is basically an air pump. So especially if you have converters that are somewhat stoped up you will definitely make a small gain in power
@SomcallmejameS
Ай бұрын
This has been proven false so many times lol
@mikezaverin
Ай бұрын
What motor and application
@vincegrimes2614
Ай бұрын
My c3 is smelly and i have cats on. Might as well take them off for better sounds?
@mikezaverin
Ай бұрын
Sure
@leonelpineda6364
24 күн бұрын
Focus on driving instead…..obviously it’s gonna gain something, theres less restrictions….engine is an air pump at the end of the day
@mikezaverin
24 күн бұрын
Thanks for watching
@Eastsidegeorgiaboy
3 ай бұрын
I don't care how hi-flow they say it is. It's not better than zero obstructions. Just like a high flow air filter is better than a paper filter, it's still not breathing as good as no filter. To maximize the lack of restrictions, a tune will definitely help. But you will gain hp by removing them. Vehicles with more than 1 cat per exhaust manifold will benefit from removing any extra cats and pre cats.
@nicky85926
Ай бұрын
I got high flow cats and it smelled like shit, tried changing the gaskets and still smelled like shit. Put the stock cat back on and noticed no difference besides no more smell. My tune and other bolt ons still preformed the same. Lesson learned, waste of money
@Kaaleenbhaiya00
2 ай бұрын
Too good
@emeraldstevens8922
Ай бұрын
You don't know jack bud 😂
@mikezaverin
Ай бұрын
I am sure, that’s why you drive a geo prizm
@emeraldstevens8922
Ай бұрын
Haha good comeback bud 👍 👏 👌
@joesalvator5878
8 күн бұрын
Not true at all, you can get up to 15 hp out of a small well tuned turbo engine. That's without a remap.
@mikezaverin
7 күн бұрын
That’s a whole different story lol
@mrmac-fb4hh
7 ай бұрын
I wish i could believe this but i did a before and after dyno with cats and no cats i gained more sound and more horsepower on my F Type. sorry didn't work for you.
@mikezaverin
7 ай бұрын
That’s a restricted manifold you have . Ls and most v8 American motors are different
@mrmac-fb4hh
7 ай бұрын
@mikezaverin I took the honey my self and added spacers to avoid check engine light I had many types brands of cars and yes it does add more horsepower especially with higher octane I love the difference in performance.
@velizarmilutinovic2947
26 күн бұрын
@@mrmac-fb4hh Did you have to do tuning on any of these or the spacers did the job and nothing else was needed
@mrmac-fb4hh
25 күн бұрын
@@velizarmilutinovic2947 the tuning came after the cats were deleted and it was done by viezu tuning I got the predator v2 wich will eliminate the check engine ligh. This usually happens when you delete the cats too much air coming out wich means more power.
@SN95.Danger
Ай бұрын
Your wrong there buddy
@IndigenousAmericanTrucker
5 ай бұрын
So, I feel like he might be right in what he is saying, but in a technical way. Meaning, that yes, removing cats maybe doesn't literally add more horsepower as in raising the set numbers, but I'm at least almost sure that it would allow you to reach the majority or, if not all, of the horsepower that your car already has, or can possibly reach via set numbers if it didnt have the blockage of the whole exhaust system! Not including what's lost via the drivetrain, etc. Which, in general terms, would mean that it gained more horspower, except it's not extra power. It's just the horspower that it should have already had, or what it was already set at. Except the exhaust system wouldn't let it reach its max potential or close to it, since you have to add drivetrain loss, too. If I'm wrong about this, then I don't mind being corrected. I'm only assuming that this is what he really means. Bcuz everybody says that cat deletes or high flows add power. So, you're not gonna tell me that everybody is wrong, and this one guy is right, unless my theory is what he really meant, lol!
@mikezaverin
5 ай бұрын
What lol?
@makeway305
Ай бұрын
Not true lol. I was able to add 3 degrees of timing because of less back pressure
@mikezaverin
Ай бұрын
In what application lol, n/a or boost
@makeway305
Ай бұрын
@@mikezaverin N/A but with a cam and heads.
@RollingRoadEFI
4 ай бұрын
LOL. Complete and utter misinformation.
@mikezaverin
4 ай бұрын
And how is that? You have Dyno graphs?
@RollingRoadEFI
4 ай бұрын
@@mikezaverin Many. Guess what I do for a living? I dyno tune. 😂
@RollingRoadEFI
4 ай бұрын
@@mikezaverin LOL! Thanks for downranking my comment. 🤡 Smfh.
@shutupnavikrant
8 ай бұрын
Omg get your facts right
@mikezaverin
8 ай бұрын
I am sure you have Dyno information for high horsepower vehicles lol
@shutupnavikrant
8 ай бұрын
@@mikezaverindo you? Can you prove it does not increase HP? I am not the one posting stuff on the internet, you are! If you can't prove then shutting down your youtube channel would be sensible.
@RollingRoadEFI
4 ай бұрын
@@mikezaverin Lol I do.
@rott_3n
2 ай бұрын
doesn't taking off cats decrease the life expectancy of the motor? I heard that v6/v8 camaros that hit over 100k miles blow motors. i have a maro n i really want to make it louder. not really sure if I trust straight piping it tho.
@RollingRoadEFI
2 ай бұрын
Quite the opposite.
@josephr.8622
2 ай бұрын
How would allowing more free flowing exhaust wear down an engine? Lol
@rott_3n
2 ай бұрын
@@josephr.8622 i dunno, i was just wondering. someone told me that, sorry.
@rott_3n
2 ай бұрын
@@RollingRoadEFI so should I straight pipe it??
@RollingRoadEFI
2 ай бұрын
@@rott_3n Your call. It'll be obnoxiously loud, and probably drone really badly. You'll also get a P0420 code.
@HondaTrumpAi
7 ай бұрын
😂😂😂😂
@phoenixelizalde9809
5 ай бұрын
Yes you do
@jordannealy280
2 ай бұрын
💀
@dand1892
5 ай бұрын
So hes using a crying dyno
@mikezaverin
5 ай бұрын
Just your normal Dyno that’s made for bald Eagle power only
@bannana6290
5 ай бұрын
nice agenda a gen duh?
@gamerfool6488
6 ай бұрын
Tell me you know nothing about exhaust systems without telling me
@mikezaverin
6 ай бұрын
Just like you know nothing about how horse power is made.
@slowcrawler2695
2 ай бұрын
Lies bro.... lies.
@bettyg7710
3 ай бұрын
Finally some one who knows what they are talking about. So listen up. Here is the real deal. Todays cats are all designed to be zero back pressure cats. Ultra high flow when compared to older cats. Deleting them makes literally no difference in exhaust performance. And on most production performance cars the engineers went to great lengths to make sure cats would not affect performance. The reason some people legitimately need to remove the cats is when they are running different fuel than pump gas between 92 and 110 octane. Exotic fuels can clog or burn down a cat. A question of street and emissions legal or not.
@RollingRoadEFI
2 ай бұрын
Uuuuh.... just FYI the OP has no clue. The last part of your paragraph is absolutely 100% inaccurate as well.
@canadianshrooomer3060
7 ай бұрын
Cayats
@AthrinMako
Ай бұрын
Incorrect
@mikezaverin
Ай бұрын
Maybe
@basketball798
12 күн бұрын
No true
@mikezaverin
7 күн бұрын
In most cases it’s true and I was talking about LS platform
@user-fm3rs5zc4u
2 ай бұрын
You're wrong
@dylandesmond
6 ай бұрын
5hp you have to tune your untuned car... Now put the cat back on.... 5hp Just tune your car and keep it legal...
@mikezaverin
6 ай бұрын
My car is beyond tuned lol
@YouStupidBunny
5 ай бұрын
This is true if the ramistans are perpendicular to the betrux hadrans.
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