Or take it to a shop with Dynojet Dyno model 168 this is what all the good shops use for tuning, Trinity, Alba, etc. I have a mobile Dynojet in a trailer that I take to popular riding spots.
I have tuned hundreds of Banshee's on it works great. www.rocketfactory.biz
My shop specializes in dyno testing, and I would not waist money on something that is suppose to calculate hp. All hp. numbers are relative to the day and unless you can simulate exactly the same pulls each time it is hard to fine tune for that extra couple hp.
Call me if you have any questions, 775 786 1372 or visit www.dynojet.com for the dyno closest to you
Jason