Sorry guys but I am all for emissions enforcement on all modern cars, gas or diesel.
In my opinion, polluting less isn’t a bad thing, nor is reducing fuel consumption to reduce both greenhouse gases and reliance on imported oil.. We are in a golden age of performance with out the traditional downsides of poor fuel efficiency and pollution. Why spoil it by being a cheap SOB? There are plenty of gas powered German SUV’s that tow well, have good performance, and which can be tuned for even higher performance without disabling their emissions systems. . . if you can’t afford the upkeep on a diesel X5, then you should buy a gasoline version. Just a personal opinion...