The fab part wasnt that difficult. u just gotta know how to weld. the pipe is 1-3/4 on the inlet and the exhaust on the atv is 1in. the fo-14 has 4 slits cut into it already so i just cut them about 1.5in deeper and then took my time and hammered it into a circle to where it was snug on the exhaust pipe, then took it off again, welded up all the seams (inside and out), the slipped it back on and welded it on the pipe. then u have to make up a bracket. i found an old piece of scrap metal and just bent it to where it was snug on the muffler and on the frame and just welded it to both and its solid