Ecobox tuning.
A collegue of mine has purchased one of these for an 06 320D BMW. It simply plugs into the fuel rail apparently and is saving him MPG .
Surely it cannot be as easy as that or else BMW would do this themselves. I informed him about a true remap from the likes of Evolution chips etc but he's 'happy' with what he has. Fair enough , but whats the catch? Are they just gimmics that adjust the fuel computer to think your saving fuel?
Mike.