Paul,
I am using the kit from Hanatech, chosen mainly because it is self contained. Two wires onto a battery, long leads, long pipe, long remote switch. I am mobile, and have demonstrated to many garages in the area, and most have called me back within days to just check for intake leaks, intercooler leaks, Egr leaks, oil leaks, and the list goes on. Get a demo, you will wonder how you managed without one,
Peter