The T5 will gain on the bottom over stock pipes, but its not really a bottom end pipe. Its more of a mid-top pipe. I dont really like fattys all that much, if I was to run a fmf pipe, I would find some gold series pipes. I dont run vf3's, but people I talk to and ride with say they make a little difference. I usually stick with the stock cage and run carbon tech reed petals.