Hey before you purchase anything, i saw in Mxaction magazine a specially designed Rad valve It is called the RAD 3. Ill write everything that they state on the add.
"RAD 3 the simple 02 cr250 cure"
"New Triple -stage carbosite reed system" Get maximum power and throttle response across the powerbans. The light top reed allows instant throttle response at the low end: the middle and top reed work mid range and top end."
"seamless precision aluminum casting, The one piece aluminum precision casting with a 60 degree apex is dyno proven to accelerate airflow into the crankcase- no seams no inserts no misalignments to slow the flow.
"Put away the Hacksaw" unlike the VFORCE and other aftermarket valves you dont need to irreversibly cut your intage boot to install the boyesen RAD3"
"new exhuast Flange" Avaliable seperately, boyesen billet aluminum specially shaped exhause flange completes the RAD3 system by taking advantage of the servo exhaust vavle for increased toque at part throttle"
Money back guarentee- bolt on a RAD3. You will experience increased power and throttle response. If you are not completely statisfied return for a ful refund ..