X5 diesel mod - unleash its true potential......

[slowlanemcvane]

This brings up an interesting point:

Is it better to throw a little more smoke in the air and burn less fuel? Or is it better to keep the exhaust clean-looking and burn more fuel?

Personally, I would rather have a little more smoke come out of the tailpipe and burn less diesel (and therefore emit less "greenhouse gas") than burn more (and emit more "greenhouse gas") only to have cleaner-looking exhaust.