ok i like LRD best, they looks really sweet and sound sweet, they have also gave more accelration and hp to my blaster. f7 are great pipes but they are not for me. my friend has a f7 and he has had problems, the first time he got it it was wrong with the mounts, the second time it was scratched, until finally he got a built correctly one. i have heard his blaster run it sounds pretty good but not as good as mine. if u have the extra money go for LRD
only disadvantage to LRD is the kick starter can hit the pipe and cause a chip but that can be fixed by taking off the nut and moving it a couple notches up.