Looks like they may increase in value soon.
People are sick of breaking manual gearboxes in turbo e36s and someone has made a kit to swap in the GS6-53 from e8x/e9x cars.
http://22rpd.com/item.php?item=36
http://22rpd.com/item.php?item=366
https://www.bimmerforums.com/forum/s...n-(S6-53)-Swap