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Old 05-22-2012 | 11:22 AM
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AllTheGoodNamesAreTaken
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From: Somewhere In, NC
Default RE: OS 65 AX
Numbers are peak using 15% Cool Power, OS 8 plug.
Stock muffler:
11x7 - 13,000
11x8 - 12,400

Macs long header cut to 4.5" and 1060 muffled pipe (there was no gain in RPM from 4.75 to 4.5"):
11x7 - 14,800
11x8 - 14,000
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