This pulley upgrade kit is used to increase (or decrease) boost on Z1's Rotrex Supercharger Kit. Included with the purchase is the selected pulley and two belts. Pulleys are available in four sizes to produce the following horsepower ratings when correctly equipped;

• 90mm, 10PSI, 400hp
• 80mm, 15PSI, 500hp

Please know that if your goal is to make more power, it may also be necessary to upgrade the fuel system depending on the desired power. If you're unsure what other components may need to be upgraded, please contact our sales team for consultation.

Compatible with the following supercharger kits:

• Z1 350Z Supercharger Tuner Kit
• Z1 350Z Complete Supercharger Kit
• Z1 G35 Supercharger Tuner Kit
• Z1 G35 Complete Supercharger Kit