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BOYESEN RAD VALVE 09-19 KTM65, BLOCK RAD-40B, TC 65 17-18, RAD40B Beanie Suzuki RM-Z450F 2012Boyesen Rad Valve RAD 40B RAD40B 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