i am thinking about taking my cat out and just puting a straight pipe in its place but i have a 97 gs with the 02 sensor on the cat, is there anyway to get around that or am i stuck with stock or some $220 aftermarket cat? also i am going to go turbo in the coming months, should i get a kit/piece one together/ or go custom?? i'd like to push 250-300 hp, will my stock engine internals support that much??