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2010-2021 Harley Davidson XL1200X Forty-Eight
1999-2016 KTM 250 SX
2020-2024 Harley Davidson FLHX Street Glide
Replaces OEM# 37550-84A
Boyesen RAD-40A Rad Valve body-bracing 2010-2021 Harley Davidson XL1200X Forty-EightAn aero form reed valve that corrects the problems associated with existing reed valve designs. Maintains flow velocity through the valve and re directs the intake charge for even distribution to the intake ports. Provides quicker, sharper throttle response and more horsepower. 1 piece aluminum casting; no manifolds to trim or plastic pieces to insert. Boyesen Pro Series RAD Reeds included. Vehicle Fitment: 1998 2018 KTM 65 SX
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