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      02-14-2012, 07:01 AM   #4
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

Catless or high flow cat x-pipe, pulley, and filter. No need to buy a $6000 exhaust. The rear exhaust does very, very little for power, but a lot of people like the sounds. It is the x-pipe that is responsible for most of the gains. After those mods, consider a tune.