Job took me about 12 hours to install the M3 bushings on my 135i, and three trips to the hardware store. What a bitch of a job. Now I understnad why the shops wanted $800-$1000 for this.
See my other post here -->
http://www.1addicts.com/forums/showp...8&postcount=29
Took the car to the track tonight with the new M3 bushing installed. Nice difference in the curves and especially through the esses, where weight is shifted rapidly from side to side. Floating and vague movement is greatly reduced. The car behaves much better over bumps when taking high speed turns.
On the street, it makes my 135i back end firmer, and more planted.
Overall, this is a great mod, and this DIY is worth the sweating and cursing...