Ricky Gadson, a pro drag racer, did 10.56@126 on a stock bike. Stock bikes tend to put down 145 to the rear wheel.
Using a 1/4 mile calculator (which will be optimistic on et, and accurate on mph)
With 220 rwhp, which is what the supercharger kit gives without engine work, Ricky could get 9.32@145.
With 315 he'll get 8.27@163. realistically, that would require a drag slick and wheelie bar to get even close, so 9's for a mere mortal who weighs a lot more than Ricky sounds reasonable.