The best ECU that you could get for power and economy is a Apexi Power FC.
The ecu is located on the passenger side kick panel. a couple of 10mil bolts and it comes out easy.
Why do you have to change maps when you are driving ? I dont understand this. Why do this when you can have one map cater for all situations ? When your on boost then you will have the load points tuned to run the mixture you need and when your on cruze you will be on a completly different load point that will run a nice mixture for economy.
THE ONLY reason you need to change your maps is if you run a high high octane fuel on your car for the track and use different timing / fuel values for the different fuel you are running like C16 / AVGAS etc etc.
Get the power FC do it properly the first time and enjoy the driveability of an AFM.