Thread: OEM exhaust mod questions
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      10-24-2011, 09:34 AM   #5
1sikbmr
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Quote:
Originally Posted by dilav View Post
if all perforated sections were replaced with straight pipes... the thing would no longer be a helmholtz chamber... so can just leave out the oem muffler.
what?

of course there still is. look at the diagram again
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