Just to add my experience here.
Ed30, Revo Stage 1 and Autotech HPFP put on December. "Fab."
Couple of months later after buying some bits Milltek DP and Cat (200 Cell), plus Dbilas intake put on.
Map not altered, now it's just Darth Vader under the bonnet and more of a fruity burble outside the car.
Car feels more sprightly over just the Stage 1, so "Even More Fab".
No issues, flat spots or warning lights, just a bin grin on my face.