I'm a week into stage 1 with cold start delete, GTS DCT, and Euro MDM. I do have M-performance exhaust. The tuning process was more involved than I expected but it got completed. My car now feels smoother and faster and I feel that Euro MDM actually free'd up some power that the US nannies was slightly cutting from minor wheelspin. I do have one gripe though. My car is now more tamed. It is a little quieter, smoother, and sort of lost some of that hair on fire feel. Of course that will all translate into increased speed on the track but I can't help but feel I lost 5-10% of the wild character. The driveability has improved with these changes though.
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