ZR1 Stage 1 Pulley Upgrade

MTI Racing supercharger pulley upgrade kit is designed to enhance the new LS9 Corvette ZR1 supercharged engine. This upgrade kit produces excellent horsepower and torque improvements over the factory 638 horsepower and 604 lbs ft of torque while maintaining a safe level of boost and supercharger RPM.  The pulley kit will overdrive the supercharger 19% to raise boost on a stock engine by 3-4 psi. The stock serpentine belt is retained but the installation will require ECM programming to adjust ECM overboost limits.

Parts included in kit:
- 2.60 inch diameter steel supercharger drive pulley powder coated black - 11 rib
- 100 mm aluminum double bearing idler assembly
- LS9 solid supercharger isolator coupling
- Installation kit with everything you need to do the installation