damn your lucky you dont need one, you get more flow and alot of people say it sounds alot deeper. idk im kind of a n00b but ive read like 1376541325415 exhaust posts and the general concencus is: no cat, keep the res or replace with glasspacks, dp u-bend are good for performance but dont affect sound much, and mufflers will greatly alter the final sound so its all choice. I think ive watched every gp exhaust vid on youtube lol and flowmasters sound best imo. magnaflow is too lazy. oh and the mufflers vs straight pipe debate will run FOREVER lol oh and headers affect sound but are expensive and we dont need em
