The issue with the new pump is the cost. Most pumps will go 60k and many BMW owners refresh the entire cooling system around that time. Mechanical pumps, even the high performance Stewart pump, were far less costly to replace.
2002 E39 M5 / TiAg / Tubi Rumore / E60 SSK / Blanton 3.45:1 7 disc 40/100% locking diff / NCS Coding / Coby Alcantara / StrongStrut STB
2000 M52TU E36/7 Z3 Roadster Schwartz*3 / Rogue RSM / Rogue Trans Mounts