how hard would it be to modify the tail section on a yzf600r to look more like that of the 99+ R6's. I like the Thundercat, its midrange pull and more real-world use sounds like a good matchup, but Im not a big fan of the fatter rear end. Would a 99 r6 tail section fit, or would I be better of just doing something like an undertail? Im looking for a bike to purchase and I can't really see anything wrong with the 600r other than its kinda portly rear. thanks!