Polaris exhaust valves open with cylinder pressure.  As you go up in elevation, cylinder pressures are reduced causing exhaust valves to open later than they should or in some cases not at all.  This can cause poor and inconsistent top end horsepower.  Changing to lighter exhaust valve springs allows the exhaust valves to open at the proper time maintaining proper top end horsepower and running consistency.  SOLD EACH (Order 2 per engine)

* Recommended for use on '08-10 CFI models at elevations above 5,000 ft

** Recommended for use on '02-05 800 Edge RMK models and '08-10 800 CFI models with SLP twin pipes at elevations above 6,000 ft

PROP 65 WARNING: Cancer and/or reproductive harm - www.P65Warnings.ca.gov