Description
High-quality, made in America. All pulleys are CNC machined from aircraft-grade 6061-T6 aluminum. These pulleys are lighter and stronger. The smaller pulley requires much less work for your engine to turn, giving you more horsepower to the powertrain — an estimated 5–10 HP increase.
Add throttle response to your V-10 with our new T6061 billet underdrive pulley! Machined in the USA from T6061 billet aluminum, this upgrade reduces the factory pulley diameter, slowing down the unnecessary power draw from accessories. This results in free horsepower gains and quicker quarter-mile times. Testing has shown an average of 5–10 RWHP and up to two-tenths quicker in quarter-mile acceleration. This one-piece pulley, made of strong billet aluminum, includes new bolts when required.
You must buy a new belt that is one inch shorter than your current belt, available at your local auto parts store.
- SRT 4/5 under-drive pulley comes with M8 x 1.25 bolts and mounting hardware.






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