After having two sets of bilsteins on my previous two m3's, i decided that i really didnt like them and that I wouldnt buy them again since they always jacked up my cars and made them look raised...
So obvious choice was Koni adjustable shocks and some H&R springs because i have been happy with them in the past.
First off, there are not many options for ordering suspensions for these "M5s" but you have to remember that the suspension on the e34 cars is so similar that you can get by with just using the components for a 535. There were no shocks available for the m5, but there were for the 535 so i figured... Hmmmm, ok, i'll just get that.
In anycase, front shocis are inserts and the back you have to eliminate the self leveling rear...
In order to get to the back shocks, you have to take your back seats and your back speakers out and then move the insulating rubber/foam so that you have access to the 3 13mm nuts.
The 535 components worked perfectly on the car, but this is definitely not a "Do it yourself" type of job. I have done many suspension systems in the past with little or no help, but with this car, I had to have my brother and one of our mechanics help me. Fronts are also quite a task, but the backs were such a pain, i regretted ever taking the car apart.
All in all, its probably about a 5-8 hour job for someone that knows what they're doing and has all the proper equipment and lift.
Results... The rear are only adjustable if you take them off of the car, so i adjusted them so they are halfway between stiff and soft, so that works out good.
The fronts are adjustable under the hood, so that works out good.
As far as the lowering... The front is down right above the tire, where as the rear doesnt really look like its lowered. Overall, i am very happy with it and since i needed new shocks anyways, i figure its much better than replacing it with factory since these are adjustable and have a lifetime warranty( lifetime of the car)
And i also replaced the sway bar bushings. I changed them over to urethane. It made a noticeable improvement and i am very happy with them. I got them from BMPD, but the back ones they sent were too small so i had to make them fit. Its very tight, but it works, so im not complaining.