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  1. Marc S

    What rear wheel hp stock?

    I put my 08 5spd on the dyno last night, it's stock with 2500 miles on it, it made 271 HP in cold Seattle air on a Mustang Dyno. I then installed the JLT intake and a custom tune, it made 291 HP and 300 ft lbs of torque. Not sure how that compares to a stock Mach 1.
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