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    Hypertech Tune -- mystery?

    2006 GT with auto trans. I have K&N Typhone CAI, Magnaflow X-pipe w/ high-flow cats, and Magnaflow mufflers. My Hypertech III tune (1) gives worse performance than stock with RPMs extended by 500 (beyond 6K redline) and each shift extended by 400; and, (2) with no RPM extensions, gives better...
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