Sick build btw. I have stumbled upon the m3 rear end. Everthing from the subframe and upper arms lined up. Used stock camber, trailing arms, hubs, brakes, e-brake line. Only thing you would need is the adjustable m3/1m rear toe arms. I bought the diff (3.15) and subframe for 650, axles 300 arms 400, and custom driveshaft that needs m3 rear and 135i front-350. My insta is 1cholic and ask away if you have more questions. I will glad to help.
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