I've got H&R 50464 springs along with Koni FSD's and M5 roll bars front and rear.
The ride isn't bone jarring at all. Handling is superb even at speeds greater than you mentioned. The twisties are even more fun, but at a bit slower speed, but still faster than the OEM suspension can take.
2000 540/6 Slightly tweeked...everywhere
Last edited by JimLev; 11-19-2012 at 11:35 AM.