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Burger Motorsports has a beta piggy back tune for the f30 328i. It's under $400 and offers comparable gains. Plus, their customer service and transparent testing and development are excellent. In my opinion, this is a better value.
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Current: 2017 F36 430i GC
Retired: 2011 E93 335i; Retired: 2013 F10 528i
Retired: 2011 E90 335i; Retired: 2008 E90 328i
Retired: 2003 E39 530i; Retired: 1997 E36 328i
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