No CEL at all, kitbkk has it on his euro and its direct bolt on. But it costs a bomb. Anyway, my suggestion is to purchase a 2.5" Magnaflow 300cell cat from ebay (costs A$150 shipped!), and go to your exhaust shop and cut the stock cat and replace it with the new cat (cost me $30). Overall I am very impressed with the gains over stock cat. No rattles, no CEL, only a big smile. BTW I have the same exhaust as yours, and for under $200 its just unbeatable.