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Doug Thorley Headers.
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07-01-2015, 10:32 AM
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owhite3003
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Drives: 2013 JDP ZL-850 Track Spec ZL1,
Join Date: Mar 2013
Location: Oregon City, OR
Posts: 1,471
I don't know what the gain is since I did numerous mods at once. The sound is killer and isn't too loud unless you open it up.
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