NOT IN STOCK

The Helix supercharger pulley is the best performance bang-for-the-buck, period. After extensive road, dyno and track testing, we now proudly offer to you the 15% reduction pulley. The reduced pulley size allows the supercharger to spin faster in relationship to the motor, pumping more air into the motor and increasing power. In an otherwise stock vehicle, the pulley increases boost pressure by 3-4 ft/lbs, increasing horsepower and torque. In a car with other engine mods like intake and exhaust improvements, boost is increased to a maximum of 5 ft/lbs.

The factory software settings keep the fuel/air mixture only slightly leaner than stock -- still very rich -- so there is no risk of excessive heat buildup, even under prolonged track conditions. All of the factory emissions equipment including catalytic converter, and oxygen sensors work normally with the pulley upgrade.

The 2-part modular pulley is precision CNC machined entirely from 303 stainless steel. It bolts directly onto the supercharger shaft without the application of heat or use of a BFH. The hub is universal for all of our pulley sizes: stock, 15%, 17%, and 19% reduction, allowing the user to interchange pulley sizes. Other pulley sizes are available through special order.