I for one wouldn't run with tire pressures that high on the road, you may wind up with more stiffness but less grip. Generally speaking manufacturers do a very good job of taking into account vehicle weight, tire loading and suspension tuning in coming up with the recommended pressures.
I run my car (18's) at 29 PSI.
Track days etc, another story.
I run my car (18's) at 29 PSI.
Track days etc, another story.