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Well, Bird's have already fitted the kit as listed for the 335i to several 335i's but not yet to a 135i. The disc diameter as fitted to the 335i is 355mm and the car seems to stop ok, so we're going with that!
The larger you go with rotors the more chance you will have of clearance issues with 18" wheels. What wheels do you intend to run? I am having a job finding any decent fitments.
Jack
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