I am somewhat confused. I am not sure if the person who sent me this info knows what he is talking about, but he now has me concerned. I removed the cat from my stock exhaust header. My motor is otherwise bone stock except I am running cobra slip ons. I have not done the stage one nor am I running a tuner. After I did the cat removal I had two occassions where the bike refused to run after I turned it off then immediately tried to turn it back on. It appears it got hot and went into limp mode, one of the times I held the throttle open and it did start but only ran on one cylinder. Both times I was riding a road along a river at less than 25 MPH for several miles. Once I allowed the bike to sit for about 5 minutes it started and ran fine. So I posted this to see if the cat removal could cause it to run hot. I got a response telling me to make sure I put the right oxygen sensor in the right hole. He told me grey to the front and black to the rear. The problem I have is the wires on both sensors have the same colored wires (I think, its hard to get in there), and I dont see any other colored marking on them although they are hard to get to. Does this make any sense to anyone and if so, can this cause an overheating issue? And if so, how do you tell which is which? I have a very long ride this weekend with a large group and really dont want any issues with my bike. By the way it is a 2011 RGU with 7000 miles and I do have my lowers on. Any help is greatly appreciated.