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      11-20-2012, 11:01 PM   #15

Drives: E90 N52 AT
Join Date: Apr 2011
Location: Vancouver, BC

Posts: 2,681
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.