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.