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the lower the effective knock protection of whatever fuel is being used
Single-exit output reuses the OEM muffler tip and spark arrestor (TIP NOT INCLUDED)
& 570 platforms
**Stock is subject to availability**
our intake elbow gives us another 2-3 horsepower over stock
XR SERIES 11MM CUSTOM AGE 625 HEAD STUD KIT FOR POLARIS RZR XP TURBO/S & PRO XP XR Series Billet Engine Cradle the lower the effective knock*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
