99-06 Silverado / Sierra Speed Engineering Header Install & Review
Recommended Parts:
New GM Manifold Gaskets - you can include these with your order from speed engineering www.speed-engi...
Quality header bolts (such as ARP 434-1202)
(4x) Quality exhaust clamps - I used “Roadformer 3" Lap Joint Exhaust Band Clamp”. I do not recommend using the included clamps.
Penetrating oil such as Aerokroil or PB Blaster (and a pistol grip!)
Manifold bolt fix it kralautoparts.... If the price doesn’t bother you, it might be a good idea to have one or two of these on hand before you start so you don’t have to wait on shipping to finish your project.
Hardware for cat-back connection (bolts, washers, lock nuts)
Oxygen sensor wrench/socket (optional) - You can also make your own out of a 22mm socket
Replacement Upstream Oxygen sensors (optional) - Denso 234-4650 or AC Delco 213-1527 (I was told these are the same physical part with different branding)
Downstream oxygen sensors may also need to be replaced if you are keeping cats. Downstream sensors use the same part number as upstream (listed above). If eliminating downstream sensors, PCM tuning or sims will be required to clear the SES light.
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