is anyone using a cat bypass or mid-pipe, either with a resonator or not, on an e36 M3? if so, what are you using and what are your impressions? '95 M3s are no longer required to pass emissions and I'm looking for alternatives or even a 100 or 200-cell replacement option.
'04 GT3, '99 MCoupe, '97 993 C4S, '86 951, '05 v70R
previous: e30 M3, e36 M3, e36 LTW, e46 M3, e28 M5, 964 RSA, 997S, 928...
I believe you will need a ‘tune’ to run better without the back pressure created by the ‘cats’.
Go for a single 3” system from the head pipes.
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Shogun tricks and tips for the E32 series are HERE!
Just don't. Your car will smell like ass, and there isn't a whole lot you're going to gain... Please don't screw up my air more than you have too.
No matter where you go, there you are...
Just to annoy Rich^^ ...I'm running full headers -> 3" midpipe -> UUC system U.
You do not need a tune for any of this, OBDI cares only until the exhaust exists the car (first and only 02 sensor). From there, the less restriction the better (in general).
My setup is very loud, I would blame some on the midpipe, and some on the 'cat'back. I don't track this car so butt dyno is irrelevant.
I would just do a catback unless you're doing other stuff (headers) that could require a new midpipe anyways. That's why I ended up doing mine.
PS I do love the smell
'04 GT3, '99 MCoupe, '97 993 C4S, '86 951, '05 v70R
previous: e30 M3, e36 M3, e36 LTW, e46 M3, e28 M5, 964 RSA, 997S, 928...
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