Whats the difference if any between the 06 RC SRT and the 04/05 as far as the exhaust goes? And the O2's?? Guess I should tell ya why Im askin, maybe explain myself a lil better. Someone has a catless exhaust sys for an 04/05 that I want to buy, but Im not sure if it will bolt up to my truck. And he just has his O2's tied up to the frame, which I know alot of you are doing, I was just wandering if it hanging them on the frame works on the 06's