Originally Posted by tibra1
Solid rear subframe bushings?
On the street you will HATE it ..the rear subframe bushings play a huge part in how the car rides…
Solid subframe bushings are meant for track only
Just curious why you want to do this..I have held the stock M3 rear subframe bushings..they are made of very hard durometer rubber and are very good imo..now if you had the mushy 335i bushings that you could flex by hand those are crap
This isn't exactly correct.
The stock M3 subframe bushings are in fact soft bushings in comparison to what they should be for a car with its weight and power delivery. The E9x M3 exhibits massive torque shock from the drivetrain and it also has a very effective rear suspension system that yields a lot of grip. That large drive force will deflect the factory bushings.
Squeezing bushings in ones hand is not an indicator of how effective a bushing is.
Having solid sub-frame bushings will minimally increase NVH. It is the changing of engine mounts, trans mounts and differential mounts that increase NVH drastically and deteriorate drive-ability. The new M5 has solid bolted rear sub-frame along with the GTS and CRT M3's.