I upgraded my suspension using the AC-SCHNITZER Pro system and would recommend it to other M3 owners. I previously owned a 328i before and the roll of the M3 too me was not very different. I wanted more so I put the sway bars and the Pro system on my car. Now I can hit corners faster and with more control. Currently living in Germany.

Hi and welcome to AF. How much did the system cost?

Are you sitting down? I paid 3700 dollars installed for the Pro Coilover set and Anti-sway bars. I am very pleased with it. Check this out, I just found out that I can upgrade to a 3:91 Differential even though I have the SMG II. This is an email to me right from the horses mouth.

We offer a rear axle with the ratio 3.91. This can be fit also to
vehicles with SMG transmission.

We need the rear axle here in our premises. That means, that you have
to send it through your BMW dealer to us or you have to visit us with
your car.

The price for the rear axle is 2.371,- Euro which equals $2,923

When I remove taxes it ends up being just under 2500. Not too bad for what you get.

If you could send us a fax number we can fax you the datas of our rear
axle.

From what I have heard it is very noticeable. That will be the next install. When I orderd my car from BMW I ordered the seats wall knappa imola red/ black and the outside color Sapphire black. I really liked the color when I saw it on the CSL. When the sun hits it it is nice.

Nice, you should post some pics, and keep us updated :)

These are very nice information... please update with some images then I we can understand it better. Any way thanks

Yes some pictures would be nice.
Schnitzer suspension sounds nice !