With my backlog of deferred maintenance on my bimmer, I am in awe of those who have everything fixed up to date, and they then can contemplate performance upgrades!
I wish I was more like you!
Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks
& How to easily find what you need