Thinking of putting one on, over the winter months since I cant ride that often, and will have some time to put on some extras like a new can, iginition advancer, steering damper, and a jet kit I hope. Any ideas on cost? best ones? ones to stay away from? how hard are they to self install, or is it better to let a pro do it? I've been checking on the net, but not quite sure what's good/bad..etc.