I've actually been considering putting a BMW engine in my Jeep.
Its relatively light weight, revs good and vanos should make it a good off-idle performer. Especially if I have the cams re-ground for torque in the 2500 RPM range.
That or a V12 out of a 750IL.....
Would still weigh less than the 6 cylinder....
If I had the cubic dollars I'd find one of the new 3 series turbo diesel engines... "Im in love!"
Dave