This is a great thread on this, the take-away from it tuning for STX wise is that you have to get a protune to do this, they have to use the factory/stock boost tables and wastegate duty cycles. The reason for the wastegate duty cycles is that Cobb changes them to allow for no speed limiter. So tell your protuner that they need to take these tables from the "Stage 0" map that cobb has, then they can do ignition and timing all they want. I am currently just getting an E-Tune for 93 octane and plan to ask about getting an STX legal map for the season. Will let you know what happens!