Is it auto or manual? My tune isn't finished yet, so i can't speak for the gains of a finished tune. However, installing the svt header has been the most powerful increase I have done, and I've tried alot of different parts. Short ram intake, volant intake, 3 other headers, 65 mm throttle body, exhaust, cams, underdrive pulley, and tuning. Svt header is the best mod so far, in addition to the larger exhaust.
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