the M3 coupe used a 3.0-liter 24-valve DOHC inline-six-cylinder engine. This rev-happy powerplant made 240 horses at 6000 rpm, with max torque coming in at 225 lb-ft at 4250. weighing in at 3175 lbs.
there are smaller pulleys available for the supercharger, as it is pulley driven off the serpentine belt. a smaller pulley increases the rotation of the unit, forcing more air. more air = more HP.
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