I thought rear wheel drive cars are only for racing and performance car ? But why, just the BMW 1 Series is using RWD, but the other series didn't use ? All series like 3,5,6,7 are much more better and need more performance than 1 Series, right ? But why 1 Series is the one only using it, since it is the cheapest among them ? I am so confused...By the way, may i know, Audi A3 and BMW 1 Series which one is cheaper ?
OMG...check this out, it written, 1 Series is the only one with RWD engine ... http://en.wikipedia.org/wiki/BMW_1_Series

All BMW are RWD rear wheel drive except the X which is all wheel drive. What the articale is refer to is the BMW1 is the only RWD in its "class." Meaning compared to other small cars such as the Golf, AUDI A3, Mazda 3, etc. Not other BMWs. It is the only small car with a inline mounted engine. The Golf etc are FWD front Wheel Drive with transverse mounted engines.

ALL BMWs are RWD or AWD. It is not just for performance cars, it is for all practical cars. RWD is superior.