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Re: Question- Stock M3 exhaust. (archive)

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Posted by pete on October 08, 2000 at 17:06:27:

In Reply to: Question- Stock M3 exhaust. posted by Mark on October 07, 2000 at 08:33:50:

often, on Audi's and VW's anyway, taking out the cc's will trip the check engine light, it also gives a good sized increase in power. It trips the light by messing up the emmissions sensors. If you need it to pass emmissions, (and don't mind light) heres what you do. Buy a cat bypass, and a High Flow cat. Have a good shop weld on flanges to the end of each unit, (cut to match length), then weld flanges to ends of exhaust system, with the emmissions sensor mounted just aft of the swappable section you just made. That way, you get it emmission tested, then go home, and unbolt the cat, bolting in the bypass.

Could someone please inform me of where the main restriction is on the stock 95 M3 exhaust. The stock exhaust manifold looks fairly smooth however there is what looks like two elongated tubular CC's followed by two smaller resignators. Which ones are the most restrictive? If either or both are removed, will this trigger the check engine light to come on and what effect (if any) does this have on the performance. Any information would be appreciated.

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