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      04-25-2014, 01:14 PM   #62
keithbickford
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Drives: 2011 BMW 135i M-Sport DCT
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Quote:
Originally Posted by Smiley1175 View Post
I removed one restriction but added in another.
I don't believe a perforated pipe would add restriction. If anything, it would act as a hemholtz resonator and smooth out the exhaust pulse and dampen the soundwave, but without adding restriction.
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