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I'm not too familiar with the JB3 as the latest is the JB4 G5 board version of the BMS piggyback controllers that can do a lot more. I would plan on selling that tune and either getting a JB4 or a flash tune option. Look into JB4, Cobb or BB Flash depending on features your looking for and comfort level of flashing.
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2008 135i - MHD/JB4, MS DP's, AMS IC, UI CAI, CDV delete, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.
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