MFactory Close Ratio Gear Set (1st-6th) K series Other Turbo Stuff Proper break-in is required in

Proper break-in is required in order to retain product warranty

Superior durability

The mantra behind the grandfather of all hot-hatchbacks has long since been that big things come in small packages

11th Gen Honda Civic Si Sedan and Coupe

MFactory Close Ratio Gear Set (1st-6th) K series Other Turbo Stuff Proper break-in is required inFITS: 8th Gen Honda Civic 9th Gen Honda Civic Acura RSX 1st Gen Acura TSX 2nd Gen Acura TSX Achieve the ultimate in acceleration with the MFactory Close Ratio Gears. Diamond Cut to exacting tolerances, from fully Carburized Forged Nickel Chromoly Steel and put through our own proprietary heat treatment process, you will not find a stronger, more reliable product on the market. Our special treatment process makes our gears several times stronger &