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Originally Posted by Wolf 335
Is there any sense in putting catless downpipes on a stock 335i?
Any gains?
Does it pass emissions test?
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Lol is this serious question wolf?
Cattless will open up 20-30whp on a FBO car. You'll automatically feel the difference and you can run higher boost. Much more efficiency and responsive.
Take the plunge, you can't go wrong. As for passing emissions, I've heard of guys passing (barely) with keeping on their secondary cats.
Otherwise put on OEM catts, reset adaption and run it for a little bit and then Test.