Hello I have a 1988 cutty supereme and I want to eventualy make it true duel exhaust how ever my local muffler shop said it cant be done that it can onlyhave a cat back system. Does anyone know why? and is there a way around it? I dont know if this helps but where I live anything 1984 of newer has to have a cat on it even though I am allowed to take off all the other smog crap and I dont have to pass an emissions test. Any advice would be appericiated. Thank you.