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      09-30-2008, 07:51 PM   #5
kyleb350
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Drives: F30 335i M-Sport
Join Date: Jun 2008
Location: LoMbard, IL

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To answer your question, though, if the downpipes make a gain on a stock engine (w/o any tune), it will sure give you a gain with SSTT. The better the tune, the higher the gains.