Hm... could have sworn the "Hoosier care guide" said 40-42psi for long life on > 3000lb cars but now I'm only finding 34-39psi!
Stock studs! The one I broke torquing the wheel on sheared right at the start of the threads. You could see there was some heat stress on it too. I'm going to have Dustin@Z1 bring me a full set of ARP studs this weekend if I can find some open ended lug nuts that will work with the stock sport wheels.