I am not 100% certain but 185mm disc is on 335, and 328 has 160mm due to 335 having larger breaks by default.
Check realoem.com (you can pull up all relevant information for your car if you put the last 7 characters of the VIN)
BMW CCA Member 454031
2011 BMW 335i xDrive 6-speed manual thrills and whistles courtesy of the N55
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