Depending on the pipe you may run into problems in three places, the front foot pegs, the center stand, and the pedals and/or pedal sprocket, though they did move the crank up on the newer tfr usas like yours (got to find me one of those sub-frames). The polini straight pipe and the proma circuit fit without modification for sure,
I am not sure about the others, looks like center stand goes for tecno circuit, and the front pegs go with the top one.., but I scored one of the two tecno estorils from treats, and can't wait to weld that puppy up, for low end you want one of those or the similiar leo vince if you can find one. Read up on them in the two stroke tuners handbook so you get an idea for what the various dimentions do.