Description
High Quality – Made in America. All pulleys are CNC machined from aircraft-grade 6061-T6 aluminum. These pulleys are lighter and stronger.
Note: Does not come with a 1-inch shorter belt. The smaller pulley requires less effort from your engine, delivering more horsepower to the powertrain. Estimated gain: 10–12 HP.
Add throttle response to your V-10 with our new T6061 billet underdrive pulley! Machined in the USA from T6061 billet aluminum, this pulley reduces the factory diameter, slowing down unnecessary power to accessories—resulting in free horsepower and faster quarter-mile times. Testing shows an average gain of 10–12 RWHP and a tenth or two quicker acceleration in the quarter mile.
This one-piece pulley made of strong billet comes with new bolts (when necessary).
- SRT 3 Under Drive Pulley comes with 5/16-18 bolts.
- SRT 4/5 Under Drive Pulley comes with M8 × 1.25 bolts.
Use a 1-inch shorter belt (available at local auto stores). Not included.






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