haha.
Well I did not have an EGR on one of my previous cars either, and I did not notice any lack or gain of mileage, performance, cooling, etc. Seemed the same to me, even with the stock US ECU.
I am wanting to get my 6M ECU back bc of the alleged better fuel map, I am curious as to how "different" it really is. Testing with a wideband, testing mileage, perhaps even running emissions testing w/ the different ECUs to see what's up. I would consider dyno tests, but "supposedly" the ECU has to have a certain amount of time to "reboot" or get broke in again, you can't just switch them back and forth and expect it to run top notch.... well... at least that's what I've read, don't know for certain.
Also need to bypass the 115mph speed limiter crap though :x