You can do a very good a very good decode of your vin here:
http://www.bmwe34m5.com/node/174
The famous and excellent
www.bmwe34m5.com website! Yay!!
Here are the ones that are not to obvious and that I actually know or could give a reasonable guess to!
Type code HC91 - Internal Model code.
Type M5 (ECE) - As above, european car
Body type LIM - Limosine as opposed to Touring
Steering LL - LHD? Unsure
Door count 4 - No idea. Something to do with Jahre?
Power 255 - Power (347Bhp is 258kw, near enough)
661 BMW BAV. CASS. III - The radio model
676 HIFI LOUDSPEAKER SYSTEM - Upgraded speaker system (or standard?)
781 LM Rad 9Jx17 auf Hinterachse - Staggered rear wheels
782 NUERBURGRING-FAHRWERKSPAKET - EDC-II selector switch and all the goodies
Regards
.