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      02-22-2012, 04:52 PM   #5
GTM_Challenge
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Drives: E46 M3, E90 M3
Join Date: Jan 2010
Location: Nashville

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Quote:
Originally Posted by kitw View Post
The sport x pipe makes negligible power gains. Not worth it. You get a slightly throatier exhaust note. I wouldn't do it unless you really want your car to be louder, because you aren't going to notice the power difference. To get power, you'll want to look at deleting your primary cats.
We had a customer dyno his car at a AA before and after and they saw a solid 10-15 whp gains as well as about the same in TQ witht he street X pipe compared to stock.
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