K2 TVS 2.3L Pulleys are available in the following sizes: 3.250" - Approximately 9-10 psi 3.125" - Approximately 10-11 psi 3.000" - Approximately 11-12 psi (Max Boost Recommended for 93 Octane) 2.875" - Approximately 12-13 psi (Race Fuel, E85 or Octane Booster Required) 2.750" - Approximately 13-14 psi (Race Fuel, E85 or Octane Booster Required) 2.625" - Approximately 14-15 psi (Race Fuel, E85 or Octane Booster Required) Learn More