you need to do more homework...
Dinan bumpstops are E39 bumpstops marked up(in price) in Dinan packaging. buying the OEM BMW part is actually cheaper, in this case.
Dinan springs are stiff(30% more than OEM) and doesn't address reverse rake
the lower you go will wear the OEM dampers faster. shockware addresses this by basically electronically stiffening the damper.
if you are sold on Dinan's marketing literature, have at it. Dinan will be happy to take your money.
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