The sprocket change alone will allow the bike to get up to ~95 mph.  The other changes really don't change the top end, but just allow it breath easier.

I cruise all the time on my bike at highway speeds keeping right up with all the traffic.

Bill

Hey Bill, my name is Terrence, I recently purchased a 2008 G20-5 Dual Sport, and I was wondering what can i do to keep up with my buddy on his KLR 650. Will these bikes do over 65 mph with some type upgrades? I've heard you can go with a bigger sprocket, but how will that effect climbing hills, I like offroading sometimes