Just cause a different cam can open more and for longer does not mean the stock head can flow it.Also, on the street it's all about flow velocity, not volume, unless ya want a dead dog til you really get rolling. Racers use the throttle different than steet people do. It's either all the way open or all the way closed, totally different than street driving.Careful or ya will turn your street bike into a dog, it's a very fine line.What works for racing real well seldom works very well on the street. Vegas