I just listed a 325ix Brake Booster with Master Cylinder on Ebay(Item #120565815205). If you are thinking of doing a e30 M50/S52 engine swap, this is the brake booster/master cylinder to use. This is a bolt on, without any modifications, to the booster. This is the same way I did my e30 and I use my car on the track several times a year, the brakes work great.
IX Brake Booster w/Master Cylinder
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