What do Underdrive Pulleys do? Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG. All pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality.
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The car now runs alot better, more miles to the gallon, high rpm revs, and close to 19 more horsepower(18.7hp).
slp-headers, high flow cats, y-pipe, magnaflow exhaust, sphon torque arm, sphon tubular sub frame connectors, sphon drive shaft, sphon rear tubular adjustable lower control arms , three inch steel drive shaft rated to hold 1,200 horse power, 4.11 moser 12 bolt rear, short throw shifter, slp flow pac, drilled and slotted bear rotors and ebc green stuff pads on all four corners, 20% tint all around, 90 mm slp mass air flow sensor, and asp 25% underdrive pulley.
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