I have an '01540i with a Dinan St2 suspension on it in the family. I'm thinking of purchasing an '03M5 for myself and would love to transfer the Dinan suspension over to the M5, and then swap the stock M5 suspension to the 540i. I have a feeling that it may not work, but am unsure.So you have stock M5 suspension already on your 540i ?
It wouldn't be the spring rates and shock valving that should be the major concern, but whether any of the components sought to be swapped would fit, as the M5 may have various pieces that might differ slightly in some dimensions or have different mounting points. I just don't know. It may be that everything fits. I do know that, for example, in e46 cars, the M3 takes different front shocks than other 3 series because certain mounting points (e.g. for the sway bar) are in different places. So your concern is a good one.Hmm, I wonder if the spring rates are different or shock valving?
Dinan PN e39M5 = D190-5722K
Dinan PN e39540 = D190-5717K