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  1. LS1/LS2 Engine Tech
    so i just brought my 04 m6 gto to a tuner and the only mods i did to the car were speed engineering long tube headers (1 7/8) deleted the cats and a k&n cai. the tuner said he got the car to peak at 360-370 wheel on a mustang dyno but every time it pull the engine would sense knock and pull...
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