Did you put the transmission in S mode by pulling the shift lever toward you in addition to using the DDC put in Sport+ mode? If so, it shouldn't have up shifted at all unless you told it to with either the paddles or the shift lever.
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Performance Center Delivery, June 21, 2013: 2013 E92 335is | Le Mans Blue | Gray Leather with Black | 6MT | 19" Style 313's | Michelin Pilot Super Sports | BMW Carbon Fiber Rear Spoiler |
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