the 32/33 door recommendation was most likely specified for ride comfort. when it comes to high speed turns, higher pressures (within limitations)are better unless the road is bumpy and the tires lose contact with the ground. higher pressure keeps the tire from deforming, or "rolling over", onto the sidewall which causes a loss in grip since the sidewall is much harder than the tread. higher tire pressures will also result in better gas mileage and can even prolong the tread life of the tire. lower tire pressures will provide better traction in snow, mud, sand, etc. chances are that if someone has autocrossed their car they added pressure prior to the event. i'm running approximately 34 psi right now. since these tires are such low profile, running much higher will really sacrifice ride comfort. and since they're performance tires and have strong sidewalls with such a low profile it is difficult in most driving conditions to lose traction anyway.