I'm a little bit surprised that someone driving a +8 gets over sensitive on emissions of orher cars.
We enjoy useless sports cars, burn petrol for the pure fun of driving and point our finger at modern cars because of pollutions? My 4/4 hardly meets any modern standards as I got an updated ECU, alternative exhaust system and an open air filter. My 2 ton Audi runs better fuel economy than my light 4/4. I wonder how much more petrol is burned to move a +8 By the way: my M3W with the "great" S&S engine from the US is most likely even worse on emissions/horsepower than your +8. At least it burns more petrol per mile than any of my other cars.
Hannes once: Green M3W; 2013 now: Red 4/4 Sport; 2011 and some practical cars for use in real life