|
Do not waste your time/money on M3 subframe bushings. Go solid/delrin or high durometer PU - 2 piece designs are very easy to install so that's a definitive consideration when choosing a set. Solid subframe bushings have almost 0 increase in NVH. I had solid subframe bushings in a 135i and didn't notice a difference in NVH from stock bushings.
Diff, trans and engine mounts make big differences for NVH. My E92 has solid diff and subframe bushings and the solid diff bushings are very noticeable. Depending on your application keep that in mind. Something in the 75-80A range for diffs mounts would be as stiff as I would go if you plan on driving the car on street often - same goes for trans mounts.
|