Kelleners power pack is basically a rebadged Hartge power pack from what i gathered online. They sell it at Turnermotorsport for about $1300. The device works pretty much just like the JB4 in concept but i'm sure they have different adjustments. The problem with the Hartge tune is that they offer zero warranty and support for non Europe customers so you are on your own if you run into any issues. Thats what Turner told me when i inquired about it.

Alan

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Current - 2013 N55 535xi Msport SAT
Retired - 2009 N54 335i Msport 6MT
Retired - 2000 M52TU 323i ASA Supercharged 5MT
More photos of my car here