Yes, aluminum wheels. The service manual says the specs are the same for both aluminum and steel wheels. This is the same spec, by the way, that the GC8 had.
I'm no mechanic, but I've read that the reason you don't want to overtorque the lug nuts is that it can warp the rotors. Dunno if that's true, but it is true that if you put tin foil in your wheels, you can jam police radar! :lol: