and a hell of a lot cheaper if it ever decides to come apart on you. If you thought it was expensive when your drive chain comes off a bike and breaks a case...wait until you break a timing chain...

 

Ive seen a ds650 with stock tires take a piped, paddled raptor in the sand. I beat a ds650 today in a straight line race on hard pack on my piped, filtered, and ported R so im pretty sure the R will beat a piped raptor.

 

ESR 310 kit is in... still don't have it fine tuned, but she's pulling pretty good.
As for the DS's & Raptors, who knows, "I know", an "R" is faster hands down, but I've found that a lot of guys don't want to mess w/ piston changes & mixing the gas. I, personally, I would rather change a piston then have to adjust valves every X amount of hours. 2-Stroke all the way......