S54
Straight 6 DOHC 24V Solid Lifter Valvetrain with Dual VANOS and Individual Throttle Bodies. 2001-present.
148kg 326lbs
Used in the E46 M3 and the last of the Z3 M-Coupe and M-Roadster.
3.2 (321-343bhp)
S62
V8 DOHC 32V Solid Lifter Valvetrain with Dual VANOS and Individual Throttle Bodies. 1999-present.
158kg 348lbs
Used in E39 M5 and Z8
4.9L (400bhp)
http://www.bavengine.com/engine.html they have some prices.