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Diamond: If your 07 is running the stock 110's you were lean to start with. I went to 115's and 1 needle shim when mine was stock and it ran much better. I think Arrow may be giving a generic response for their exhaust. Try to find a good tuner with a dyno and forget the dealer.
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"Another Trumpet Rat enslaved to a Bonnie"
07 B/B, AI gone, Emgo 60's Cocktail Shakers, K&N Pods, ARKed 40/142, 1 shim, +1 risers, Custom gauge bracket, never ending tinkering
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