Short blast down the street to test out the exhaust mod on my E92 M3. Total time to cut open the muffler, remove fiber glass packing, wrap two pipes and weld it shut was 2 hours. I'm running Turner Test pipes that delete the 2 primary cats with a stock mid pipe (metallic secondary cats and resonators.) I only opened the driver's side of the muffler to manage the sound level and rasp. This also reduced the time to complete the modifications compared to opening both sides of the muffler which sounds very loud and raspy with the cat delete. In total approximately 3" of perforations were wrapped with muffler repair tape on each pipe to get a more raw sound with no drone in the cabin. Total increase in sound ;evel is about 10% at cruising or light throttle but 30% louder at cold start, during wide open throttle or under heavy load. Now I can hear the exhaust roar during track days.
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BMWTuner55 E92 M3 Exhaust Mod Turner Test pipe primary cat delete
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