I think what he is saying... that with the ECU Unleashed + a proper dyno tune is the optimum circumstance with aftermarket exhausts, filters, and basic bolt-on parts.
Now, for you guys that already have a custom map done through your powercommander, or whatever - Ecu Unleashed has a way of importing that map - with some very important additions - into your existing Ecu, enabling you to be rid of that powercommander completely. But as I said in a previous post, it is not exactly what you think, and I need to elaborate, since it is even better than you may think. I will do so in an additional post before the end of today. Gotta go back to work . . .