i actually have heard that about the dyno, so do the front wheels have to spin the same speed or what?, and how would you really power the wheels to spin 15 mph, any ideas will help cause thats easier than trying to beat the traction control in the ecu or any other way to get a good dyno run, i went one plug cooler, and yes i highly recommend the af gauge but do not get one of those gauges with the little light that goes back and forth from lean and starch and all that cause they suck and are innacurate. get a wideband made from PLX in my opinion.