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      09-25-2012, 08:56 PM   #293
Andrew@ActiveAutowerke
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Drives: 2014 435I M-sport
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Quote:
Originally Posted by BimmerPower View Post
What about the back pressure? It's a muffler delete after all.
The placement of our drone chamber will create some back pressure. Ill take a picture and show you what i'm talking about.

Gaines were seen throughout the entire rpm band except for redline where it matched that of the stock muffler.

Ill post some official results tomorrow but I believe it was 5-6 whp and 7-8 wtq.
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