Synchrotech Synchros are carbon lined for ultimate performance! These are not your average synchro rings! They use carbon friction technology that acts as a braking material during gear engagement. This allows for quicker and more precise shifting.

1st-6th carbon synchro set specifically for the US 06-09 Civic Si "PNN4/PNN3/SPNM" 6-speed manual transmission with triple cone 1st + 2nd, dual cone 3rd-4th, and single cone 5-6th synchro design. Normally attached to K20Z3 engine.

Please note: Synchrotech parts cannot be canceled / returned or exchanged.