Rush Big Louie slip-ons no baffles 

Hi, Russ, sorry for the late reply. I've been told that if you still have the catalytic converter you don't need to adjust anything, because it doesn't change the back pressure enough. I only had them out long enough to do the video and I put them back in. If I were going to leave them out, just to be safe, I would want to have a tuner or at least a reflash from someone that can do that.