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      02-09-2013, 10:07 AM   #70
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Drives: 2013 E92 M3 Mineral White
Join Date: Jan 2010
Location: Cameron, NC

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2013 BMW M3 E92  [4.75]
2007 335I Coupe  [5.00]
Originally Posted by momo3605 View Post
So I have a question, what part of the exhaust do the test pipes replace? Can you still run it with any full exhaust? Or can you run it with the stock exhaust without the ACM mod...the noise is too raspy
They replace the Pri Cats! you will have to cut the cats at certain point and replace with the Test Pipes by clamping or welding is your choice. you can run it with the factory exhaust, with a full Exhaust you will be removing the test pipes and getting ESS to create another file with the full exhaust configured in it. If I'm correct that's how it is.
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