I'd do all 3 items:
1- Flex Disc (SGF brand)
2- CSB (BMW only)
3- Regrease the REAR CV Joint (all you need is the gasket and some heavy-duty grease)
Sorry, I don't have the DIY for your 4.4i, but I did all 3 items on my 1998 528i and posted all the tricks here:
DIY: 1998 528i (160K miles) Giubo, CSB, Rear CV Joint Re-grease
https://www.bimmerfest.com/forums/sh...d.php?t=914069