I don't think Martin Turbo Systems are even in business anymore.. They were around in the late 70's, early 80's. Friend of mine ran one on his tow rig, worked fairly well and added decent amount of torque for towing. I've seen the Vette one's installed, but not for a bunch of years now. Might be hard to find much information about them, but it would be worth a search with Google to see if anything turns up. Might be somebody out there hoarding some parts and information about them still.