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      03-16-2013, 10:07 PM   #12
dmk08
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Drives: 16 M4 ZCP
Join Date: Jul 2012
Location: Atlanta

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Quote:
Originally Posted by RogeM3 View Post
what's the ACM way?
They open the Helmholtz chambers and replace the pipe with a strait pipe out the tips. It's pretty much just removing your muffler all together except its still hanging there so it looks stock.