You may regret that in August in Az. I am not a pro race driver and 75 lbs makes no difference to my car. Cool air makes a BIG difference to me.
Naw, I doubt I will drive her much in that kind of heat, she likes to cook oil. Although with the removal of humidity I doubt that kind of heat will bother me much. Seriously, you want oppressive heat, come visit Joe or I on july and august, you will think the desert south west is air conditioned