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BMP primary spring
**These pipes only come ceramic coated due to close hood tolerances**
Works on all turbocharged Polaris RZR models
you’ ll see our clutching hold RPM much better and track speed will increase because of this
preventing localized turbulence that forces individual reeds to over-flex and crack
Replacement Billet Head Domes for Polaris (800 / 850 / 900) Category_Default Category/SLED/Arctic Cat/F1000 BMP primary springReplacement Billet Head Domes for Polaris (800 850 900) Tune your engine's compression ratio for optimal horsepower and elevation with Bikeman Performance Replacement Billet Head Domes for Polaris snowmobiles. Designed to fit seamlessly into Bikeman Modular Billet Head shells, these interchangeable domes allow you to quickly alter combustion chamber volume to suit changing mountain elevations, high octane race fuels, or low elevation pump gas setups