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      10-24-2012, 11:25 PM   #17
Fen335i
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Drives: e92 M3 / X5d / Z4 M Roadster
Join Date: Jun 2008
Location: Pacific Northwest

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^ You will see very very similar gains. And perhaps a bit cheaper depending on the shop. Mine cost $300 installed with welds and it turned out really well. Paired with a Dinan rear exhaust it sounds absolutely perfect and no drone. The power gain is very noticeable.... as others have said it does need to be finished off with a tune though. That's my next step. Good Luck!