BMW 3-Series (E90 E92) Forum - View Single Post - Custom Catless Manifold + BMS Downpip Fix Install

mapleridge · 11-20-2012, 10:01 PM

You should dyno before doing all the exhaust mods. My last exhaust with cat delete showed about 2hpgains. Wasn't worth the money. Stock system is quite good. I think removing the restrictions in the cats is all that is needed for power and tq.

11-20-2012, 10:01 PM	#15
mapleridge Banned 151 Rep 2,638 Posts Drives: E90 N52 AT Join Date: Apr 2011 Location: Vancouver, BC iTrader: (4)	You should dyno before doing all the exhaust mods. My last exhaust with cat delete showed about 2hpgains. Wasn't worth the money. Stock system is quite good. I think removing the restrictions in the cats is all that is needed for power and tq.
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