View Single Post
      07-07-2009, 02:17 PM   #4
Brigadier General

dlbrooks18's Avatar
Drives: e90 335i
Join Date: Nov 2008
Location: Los Angeles

Posts: 3,581
iTrader: (2)

without ecu tune, no real noticeable gains at all.. downpipes would be a better mod over exhaust alone, good gains can be had in combination with the stock exhaust.