I am looking for an aftermarket exhaust for my 84trx200 will any mufflers switch over from the 84 atc200m,atc200x,atc200s,atc250sx,atc250es to the 84trx 200?. In my clymers manual it shows a picture of the exhaust for the trx200 atc250ex and atc200es and its the same muffler and header pipe. I also can buy a universal fmf pipe but i dont know what to measure the end of the header or the begening of the muffler?.