Bought a evo x with apparently some work as far as i can tell might be a after market dp and catback, i also dont see any cats but i see two spark plug fouler on the two 02s but im still throwing a 420 and 133 code? now i dont no if its tuned or not should i just throw stock dp and exhaust on or try and find a tuner around my area maybe he can tell me im not sure...