XR SERIES 11MM CUSTOM AGE 625 HEAD STUD KIT FOR POLARIS RZR XP TURBO/S & PRO XP UTV BOOST PIPE Order your kit with an

Order your kit with an extra belt

and allow easier access to the plenum

HCR's Long-Travel General kit has been proven and tested over time and given similar design and strength properties such as our full Long-Travel kits built for racing applications

These custom studs are designed to replace the factory head bolts and can be installed without having to remove the head

EVP's Proprietary Injector Adapter Plug (no wires to chafe or electrical resistance issues that can plague adapters pigtails) and our EVP‚ unmatched ECU Power Flash

XR SERIES 11MM CUSTOM AGE 625 HEAD STUD KIT FOR POLARIS RZR XP TURBO/S & PRO XP UTV BOOST PIPE Order your kit with an*STOCK IS SUBJECT TO AVAILABILTY* Prevent premature head gasket failure on bigger power engines! The XR Series CA 625 11mm direct replacement Polaris XPT head studs are for those wanting the ultimate strength for high horsepower engine builds. Manufactured by ARP using their proprietary Custom Age alloy, the XR series head stud is the strongest head stud available anywhere. Custom Age 625 alloy typically equals or exceeds the clamping force of ~2mm