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09-13-2011, 05:58 AM

#2

arobatx

Join Date: Jan 2006

Location: Kalona, IA

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RE: Back Pressure?

Did you retune the engine? I'm going to assume you are running a two-stroke, and they can be very responsive to muffler changes of any kind. I would be certain to retune properly before modifying the muffler.

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