Just wanted to post some pics of the E92 M3 subframe that I have bought.
The cheapest I could find was $2340 minus the brake rotors or calipers. Already have the M3 driveshaft so just have to wait the 4-6 weeks for this to arrive.
I was initially looking at getting a Quaife, but after speaking with Peter it seemed like a much better upgrade. You get a M LSD diff, thicker subframe and all the control arms, bushings etc., already installed.
The 135i 6AT diff ratio is 3.46 but this is much shorter at 3.85 as the N/A M3 peaks higher up its rpm band. I am expecting it be like being in DS but only in D mode.
Now I just have to get the front M3 bits to match.
EDIT: This is the box it is shipping in, the sway bar is on top but dont have any pics of it.