I run 5 3/4lb-6lb psi. Depending on how much my car bites I will adjust Tire pressure. If it has to much bite or hooking to hard I will lower the Air Pressure or Wheelie Bars. If I am spinning I will raise the air pressure or wheelie bars to get some bite back in the car. 2450lb Monte Carlo running 4.70s-5.30 classes. 16x16x33.5 beadlocks M/T This will be my last set of M/t I ever own though. Going back to my goodyears. If my car feels unstable, normally its a shock adjustment and not the Tires being to low.