mine is an air commander from airlift. i paid a little over $800 dollars for it. The compressor used by airlift is a york, this kit is designed to put out 150 psi, but they can put out much more air than that. since this kit is designed only for 150 psi it has a pressure relief valve. when the pressure gets too high, the valve opens releasing excess pressure. since i want to run higher psi, i have to do one of two things, eliminate the relief valve, or get one designed to withstand more than 150psi. if you want an engine driven, talk to Larry (IRSD_mini) he can hook you up with whatever you need.