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      04-30-2010, 01:42 PM   #157
jeremyc74
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Drives: '08 135i Montego/Terra
Join Date: Feb 2008
Location: Evansville, IN

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Quote:
Originally Posted by ianc View Post
Anyone noticed any definite deterioration in mileage after doing this mod? Seems unlikely, but...

ianc

I don't see any way that's possible honestly. The A/F ratio is controlled, and this isn't going to alter it. Also, if it were true, people running aftermarket exhaust would have the same problem, and I haven't seen where that's the case at all.

Someone's going to have to explain the dynamics behind backpressure helping fuel economy before I buy into it personally.
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