Originally Posted by slowoldguy
I haven't checked the regs but I don't think the race bikes are making that many more HP than a well-tuned streetbike. Lots of fellas dynoing about 95 rwhp. Without displacement, headwork and internals, I am betting that's close to max.
The Vance and Hines XR's simply add the X pipes from V & H and their Fuelpak and dyno tuned. That's all. They are all at about 85 hp.