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Old November 12th, 2010, 03:18 PM   #8
Join Date: 04-21-10
Location: Sidney, Oh
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its the exhaust back pressure valve doing that, sounds like ass too. Its a butterfly type valve in the exhaust and is supposed to restrict the exhaust to help it warm up faster. Mine warms up the same no matter what and I have mine unplugged, I have noticed any difference except the noise is gone now.
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