I don't think we'll see many cars under 3000 lbs anymore. All the safety equipment and reinforcements that are needed for todays safety standards are heavy.
Why the 1er? TUNING!
http://www.bimmerfest.com/forums/sho...d.php?t=165585 Software and exhaust will net a 100hp gain!!
Diffsonline will have an LSD for this, if it doesn't have one.