The single rear brake has always be a bone of contention doubt the rotor is bad and yes to the rest of your questions about add on's. Just search in the engine and electrical threads for the upgrades. Did you replace the fuel filter as it may be partially blocked. If you hit 50 a few times you may have a aftermarket CDI and a machined sheave.
FLOYD, SANDI & Sadie is the co-pilot. 05 660, 3000# GORILLA WINCH, LED headlight Mod, 12' led light bar RZR seats, 2" CFM lift kit, Resi shocks, TUSK TRILOBITE HD tires stock 12" rims, CUSTOM PAINT(the rescue chopper can find us know)
"REMEMBER, SPEED KILLS, BUT IT WILL BE THE ONLY TIME YOU'LL DIE LAUGHING"