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      08-28-2018, 01:34 PM   #3
M3ANMACHINE
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Drives: 2011 E90 M3 + 2014 F15 X5
Join Date: Jan 2010
Location: Irvine, CA

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Quote:
Originally Posted by SFCM3 View Post
Just run test pipes, have a competant exhaust shop add a flange to the back of the pipe, and to the back of the primary cats after cutting them off. that way you can swap out the test pipes on track days. seems to be the only solution it you want oem sound levels outside the track...
Agreed. V Band clamps for the front cats and test pipes would be your best option.
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