I'm going to have the Power Flex polyurethane bushings and the Bilstien Sport rear shocks installed soon. Based on the improvement to the front end of the car, I think new shocks and the sway bar bushings (plus any worn bushings that my indy BMW mechanic finds when my car is on the lift) should make the car feel great. It already feels better than most new cars I have driven... and my E39 is 10 years old and has 150k miles! P.S. If anyone has any M-Sport II sway bars gathering dust somewhere... please send me a P.M. and I'll take them off your hands!