That's not a CEL it's my TPMS. I have 17" winter wheels on and didn't get sensors for them. Race/Test pipe doesn;t give a CEL as that cat isn't monitored. Install was a little over an hour for me but that was mostly having to get diffrent sized wrenched. The stock bolts are smaller than the ones they give you with the pipe. I also had to rethreat one bolt because the threats were TRASHED.