Quote:
Originally Posted by Melsh113
Personally I found doing high flow primary cats on my car made a bigger difference then deleting my resonators and secondary cats. Obviously the secondary cat and resonator delete will add some sound to the car but not nearly as much as changing the primary cats did for me. Also, I dynoed my M3 and just from doing high flow cats I picked up an extra 20 whp which I was really surprised about. My M3 finally sounds like a true German performance car!
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upgrading the downpipes makes a huge difference.