Jet Performance 90126 Jet Underdrive Crankshaft Pulley;Category: Cobra Underdrive PulleysCrankshaft PulleyJet Underdrive Crankshaft Pulley;FEATURES:Adds 10-30 HorsepowerIncreased Fuel EconomyBetter AccelerationOne Piece Billet Steel ConstructionReduced Drag From Power Robbing AccessoriesThe Jet Underdrive Pulley Set reclaims lost horsepower and mileage by reducing the drag placed on the engine to drive the accessories such as the air conditioning, power steering and water pump. The Jet Pulleys slow down these accessories to allow the engine to turn with less effort without any adverse effect on the operation of A/C, power steering, charging or cooling systems. Installation consists of simple bolt-on replacement of the stock pulleys. Kits include pulleys, hardware, complete instructions and part number for new serpentine belt, most kits will require use of smaller size belt. Belt is not included with kit. Number and type of pulleys will vary per application.Jet Performance Products is a proven leader in automotive tuning technology. Our background in tuning started with Jones Performance Fuel Systems over 40 years ago. Our Fuel Systems Division has given us the opportunity to tune everything from NHRA drag race cars, off-road race trucks and Sprint Cup cars. This experience has been the basis for our line of performance tuning products for street applications. JET's engineering staff is unsurpassed and considered to be the best tuners in the industry. Our talented staff has made the company what it is today. Constant changes in computer technology of today's cars and trucks demand that the JET engineering staff be the best. Automotive computer systems progress daily, just like every form of technology, so we are dedicated to providing the customer with the latest in performance tuning technology possible. Extensive research and development, dyno testing and constant fine tuning ensures the most power from each part we make. JET's quickly growing staff of professional engineers and a highly dedicated team of performance enthusiasts run our everyday operations. Our ability to produce the best tuning in the industry gets you the end results that you want . . . MORE POWER!