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I think you are confused...(more) (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by Jon on March 01, 2001 at 16:56:52:

In Reply to: Re:What did the factory use on non-cat??? posted by Doug on March 01, 2001 at 16:19:08:

I believe the 215hp version you speak of was the one on the Cecotto and later Euro M3s. This motor had catalysts. It was the EvoII motor with cats and without the lightened flywheel. These engines had higher compression, different cams and valves, etc. from the earlier motors.

The earlier euro cars had a resonator and 200hp. The EvoII had a resonator and 220hp.

There is a pattern here: Resonator makes about 5hp more than the cat. I believe this is because the resonator has the crossovers for the proper tuning of the pipe lengths while producing less back-pressure than the cats. Straight pipes have less power than the cats because of incorrect tuning of the exhaust.

So, you can go with a stock or aftermarket resonator and you will likely gain a few hp. It will, of course, be illegal for the road and bad for the environment. Whatever you do, don't just cut up your exhaust. You'll likely lose power.

-Jon


I guess what I'd like to know is what the factory used instead of a catalytic converter for the European version w/215hp.





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