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      03-16-2013, 09:07 PM   #12
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Drives: 2011 E92 M3
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2011 BMW M3 E92  [0.00]
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.
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