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Thread: OS 91 FX help please.
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Old 02-06-2006 | 03:03 AM
  #3  
zain
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From: richmondbc, CANADA
Default RE: OS 91 FX help please.
A pitts style muffler from bisson or slimline will solve your problem.

this engine requires a good back pressure so i wouldnt mess with the stock muffler.

zain
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