Carlisle Ultimax 3 has evolved into Ultimax PRO. Thicker cross section so more surface area is in contact with clutch. New cog design dissipates heat and aids flexibility Runs cooler for better performance. Run cool, run long & run fast with Ultimax PROAdditonal Fitment:2005-2005 ARCTIC CAT FIRECAT 5002005-2005 ARCTIC CAT FIRECAT 600 EFI EXT2005-2005 ARCTIC CAT FIRECAT 700 EFI EXT2005-2005 ARCTIC CAT FIRECAT 500 SNO PRO2005-2005 ARCTIC CAT FIRECAT 7002005-2005 ARCTIC CAT FIRECAT 600 EFI SNO PRO2005-2005 ARCTIC CAT FIRECAT 600 EFI2005-2005 ARCTIC CAT FIRECAT 700 EFI SNO PRO2005-2005 ARCTIC CAT FIRECAT 700 EFI2005-2005 ARCTIC CAT FIRECAT 700 SNO PRO