All I can say is customer support was able to hook me up with an update to remove the current tune on my truck so I can program it with the predator 2 and I’m beyond satisfied with the overall outcome of the tune. 87 Performance tune is what this truck needed. The shifting is so smooth now and it ...

Hello, I’m currently have the same issue. I bought a 2009 GMC Sierra 5.3L Z71. To my diagnostics of the truck, the only mod it has is a flowmaster but still uses stock exhaust pipes. After reading my engine and trans, I get the message “Calibration files not stock”. I sure hope I can get this fixed ...