Just my opinion but all of your bikes are not tuned the same. You all have made minor adjustments to the motor by messing with airbox,carb,porting and pipe etc. You know somethings are gonna work better then others depending on what youve done to your application. Do what you can do, if it works great, then fine!!!! If it doesnt then try something else. No 2 bikes are the same, or are they? The Rad valve came on my bike, and i bought new fiber reeds for it. It works Great!!! Yiiiii-Peeeeeee for me. lol But its just my 2 cents.