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#14: 11-20-2012, 01:10 PM
JoeFromPA's Avatar
Title: Burning Monkey
Location: West Chester, PA
Car: 2015 m3, 2008 BMW 535xit
Posts: 3,853
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Bang for buck + Emissions compliant in MOST states =

Catted DP OR a stock downpipe with ONE cat remaining and ONE cat gutted
De-catted Up Pipe or aftermarket up-pipe with no cat
Opensource Tune (or Cobb AP for comfort) + custom e-Tune from a well regarded forum member

You are looking at ~50whp and 80wtq over stock with this combo, for anywhere from $300-$1000 depending on your route.