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      11-02-2012, 04:44 PM   #24
Wolfinwolfsclothing
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Drives: E92 ///M3 Coupe
Join Date: Sep 2012
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Quote:
Originally Posted by cntgetm3 View Post
So all the test pipes Are pretty much the same thing?
Yes, deleting primary cats will have the same effect no matter which method you do so. Removing secondary cats as well has some effect but very minor. I think Evolve's research suggested it was maybe 5 whp at most.