2004 545i SMG
I just bought a 545i SMG, its my second BMW and im very new to all this, I hope to get some guideness here
First, how can I know if I have SMG I, II, or III ? I just read online that these 3 types exist.
Second, can I modify the SMG or upgrade it ? is it only a software upgrade? or what software upgrades can i do to make it perform better
third, the key-remote only work if i go close to the rear wind-shield and also radio reception is lost when i go out of the city ( what could couse this ?)
I know its a lot to ask especially that im super new here but i hope to get some answeres from you guys
The car has a M5 rear bumper and an M5 exhaust