Mastro's is the one that is a hub dyno right? Pull up, jack the car up, pull the wheels off, align all the hub boxes, bolt it up and then do dyno pulls and then do reverse just to get your car back? To me that means a waste of time, money and energy. Hence why my opinion of it is a POS. I would much rather drive to Aerocomp racing, pull my car into their a/c garage, pull up on the dyno, strap down and start making pulls. When I'm done, unstrap it, put it in reverse and go on my way. Less money, less time, less energy and you get the same results if not better. Is that good enough of an explenation RoadRacer?