Hi Tom,
Your stock ECU will cope with changes to the exhausts and air filter. It's only when you go to higher lift cams, such as the 569, that the ECU needs re-mapping. .
For info, I doubt very much that MMC would reflash an ECU for a third party upgrade as the reason it is locked is to meet emissions regulations.
When the Stage 2 cams are used you will get the message on ProTune , “exceeds maximum limits” or something to that effect but it does not say which limits it exceeds. Do you know what has been exceeded?
