SDI Dual Rate Shock Spring Kit RZR XP Turbo 4 SeatSDI Dual Rate Shock Spring Kit for Polaris RZR XP Turbo (4 Seat) Product Description The SDI dual rate shock spring kit for Polaris RZR XP Turbo four seat models is engineered to improve suspension performance, stability, and ride comfort. Through extensive testing and tuning, SDI developed this kit to convert factory suspension into a true dual rate spring setup, allowing both tender and main springs to work together throughout the suspension travel.

and Commander 1000R models

Yes — this hub fits across the full Polaris RZR lineup including Pro XP

POLARIS PRO R/TURBO R 3-PIECE FRONT GRILLE

aggressive exhaust note that is clean

This rebuild kit provides a fully assembled

corrosion-resistant and built to survive desert

Improve ride quality and suspension durability

keeping rear suspension geometry consistent through full suspension travel

Not compatible with Smart-Shox modelsBall joints will NOT work with this arm

🧱 304 Stainless Steel

OEM harness compatibility ensures factory-fit integration

an aggressive ECU hard flash