Get Up To “15” Extra Horsepower In 30 Minutes!
You’ll also get better fuel milage and increased accessory life!
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.
1998-02 LS1 25% Harmonic Dampner Crank, 15% Alt. Pulley Kit
ASP LS1 underdrive pulley kit reduces parasitic power losses associated with high accessory speeds, freeing up additional HP. It also reduces the rotating inertia on the front of the crankshaft allowing for faster revving. We have seen just over 13 rear wheel hp increase with this kit installed on stock LS1s.
NEW 2010 Camaro Pulley Kit (p/n# 541430)
Camaro / Firebird / Cadillac
Camaro / Firebird Street Pulleys
Black Nitride (Serpentine) .20
+ Second Quarter-Mile Gain
Part # ASP540801
Nitride Overdrive Alternator Pulley
“LT-1” 2 pulley Kit
“LT-1” 34% Add-On Crank Pulley 15% Alternator, .1 to .15 Second Quarter-Mile Gain
Part # ASP847601
Corvette / Cadillac CTS-V
* Will not work with LT-4
** Will not work on Z06