my cat is plugged and i want to gut it, but i dont want to pay alot for a new one from toyota when emissions comes around next year. has anyone been able to fit an aftermarket cat in the stock location? which cat did you use and where did you buy it? how hard was it to make it work? i have a KO 2.5 inch exhaust, i dont know if that will make a difference or not. thanks in advance.