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The European 23i and 30i use a 300 x 20 rear disc, while the 35i uses a 324 x 20 rear disc, funny thing is that they all use the same caliper [different pads though]. I went with the E90 Performance Brake Kit for the front, and will upgrade to the 35i rear discs/pads once all the parts arrive. BMW in Hockeneheim says this will fit and will pass the T.U.V. and will keep the front and rear brake performance pretty well balanced.
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