OK, I am still trying to work through this and after reading and re-reading all the post am hoping I can rekindle the discussion and get some of the folks who have done this mod to offer their input. I am specifically looking at the rear brake conversion on the LCI 328xi Wagon (e91).
I have sourced all the calipers and am confident the front will fit with minor modifications, but it is the rear brakes I am confused about...
this thread indicates a solution in part #34216795755 and speculates it will fit a 328xi. But they individual who claims this did the conversion on a 325xi, which has different original rear brakes and the same thread goes on to incorrectly claim that the 325, 330 and 328 all have same sized rear brakes as the 328xi, a 300x20 rotor. However, my US spec 328xi according to realoem has a 312x24.
The suggested part that is said to be a rear performance rotor for a 335 is a 324x22 rotor. A number of people speculate this should fit that, but the only evidence I can find is this being done on a straight rwd 328i and the brake pad not reaching the edge of the rotor, and on a 325xi in europe which has different oem rotors and parts to the US spec 328xi.
In this same thread there is a suggested e65 eurospec 7series rotor, but again it is unclear as to whether it worked on the wagon. I'm at point of buying my rotors and would like to do it once, so am obviously looking to get some confirmation for which rotors work on a US spec, 328ix wagon.
The 135 rear rotor from factory is a 324x22 and has part number of 34216795754 for the performance rotor, has the same sized 185mm parking brake as the 34216795755 but having had a 135 I know that the rotor hat is to tall for the e91, so am left to assume the*5755 part number being one number off may be correct, but am looking for some validation.