I have a 2015 CTS V and put headers and a CAI on it. I got HP Tuners so I could delete the cats and not throw codes. I'm new at tuning and the car was fine until today when after a full throttle pull it gave me a bank 2 lean code and started popping and missing. I cleared the code and took it back out it was fine until I did a full throttle pull and the it started popping and acting like it was missing again. Can someone help me out and tell me which way to go with the tune. Any help will be greatly appreciated. I?m not looking for a free tune I?m looking for the direction I need to go.