I also have the downpipe cat delete but i had the MIL before i installed it. It first happened a week after i installed my takeda. I believe my MAF is in the right way you can see it in my garage....i just don't know what to do anymore i hate not having sport mode! I cleaned it off with rubbing alcohol and reinstalled it the other day but it popped up again. How did you do the ECU reflash? Disconnect the battery? I tried that multiple times ugh....thanks for the help man i do appreciate it i'm just so frustrated.
Kenny do you get a Check Emissions System MIL on your dash from your takeda....im still getting one from time to time and it seems that no one has any problem solving ideas. Just thought id see if you were in the same boat as me man