One thing I've noticed so far is the TPMS on the GT350 is very accurate. You get an accurate readout to the nearest PSI on each tire. This will make checking pressures after sessions automatic without manually checking each tire. I know you can't get fractional psi, but I'm not adjusting that precisely anyway. I plan to order them for my two sets of track wheels, assuming they're not terribly expensive. I looked on Levittown Ford's site but didn't see the GT350 listed. They are metal valve stems and I'm assuming the ones shown for the 5.0 GT are rubber.