I have the same setup as Gizmo and have also installed the Big bore throttle body. It has not made a huge increase, but the car does respond quicker to the throttle and pulls smoother. I think it was worth the money.

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06 SLY, Sand&Steel, Clear Bra, CAI, TRI-Y long tube headers, high flow CAT, Magnaflow cat back dual exhaust, ECM tune, painted calipers w/decals, large bore throttle body