BOYESEN 1998 RM125 BOYESEN RAD BLOCK RAD-21D Heat Shield Built to be your go-to

Built to be your go-to layer—clean

Kawasaki ER5 2005

YZ 450F 03-07

Monster 900 City Dark

Designed for everyone from pro riders to the off-road weekend warrior

BOYESEN 1998 RM125 BOYESEN RAD BLOCK RAD-21D Heat Shield Built to be your go-toBoyesen Rad Valve RAD 21D RAD21D Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low , middle and especially the top end ranges One piece aluminum casting, no trimming