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ASP Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. Auto mechanics use underdrive pulleys as a replacement pulley that contains a different ratio and material specifications that free up lost horsepower. By using an underdrive pulley, you are increasing the diameter of each accessory pulley and decreasing the ratio of the crank pulley. The speed at which the accessories are turning relative to the engine's rpm's decrease. By installing a resized pulley, the accessories are slowed. This results 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.Why should you buy an Underdrive Pulley by ASP? ASP has been in operation since 1988. All ASP pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality. ASP pulleys start out as as a solid bar of either 6061-T6 Alum or 1045-carbon steel. Order an ASP PULLEY system from LMPerformance and see the difference.

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ASP LT-1 pulley 23% Crank Nitride Firebird 1993-97 V8
ASP LT-1 pulley 23% Crank Nitride Firebird 1993-97 V8
Catalog #: 0078419
Sale Price: $152.20
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ASP 1994-98 Mustang V6 Crank Pulley Only (no balancer)
ASP 1994-98 Mustang V6 Crank Pulley Only (no balancer)
Catalog #: 0015839
Sale Price: $94.45
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ASP 1999-00 Mustang V6 Harmonic Balancer Crank Pulley
ASP 1999-00 Mustang V6 Harmonic Balancer Crank Pulley
Catalog #: 0015838
Sale Price: $333.90
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ASP 2001-04 Mustang V6 Harmonic Balancer Crank Pulley
ASP 2001-04 Mustang V6 Harmonic Balancer Crank Pulley
Catalog #: 0015837
Sale Price: $333.90
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