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I would not recommend running them over the max psi that the tire is rated for.
General tradeoffs:
overinflation - better gas mileage, potentially quieter ride, won't feel so mushy, slightly longer tread life
underinflation - better acceleration traction, my guess is better braking distance, softer ride if that's your bag, could also yield better cornering results
As far as lowered car specific, I'd say it's not too different than for normal cars. Obviously the higher pressure the less likely you are to dent your expensive rims if you've got low profiles, but you're more likely to jar things loose in your suspension because it's an even stiffer ride. I'd rate is as more of a personal preference.
Again, I'd still stay below max cold psi.
Anybody know what temp they measure max cold psi at, though? It does make a difference if you fill them up in the winter when it's 2C out (or -5 for some of you) versus 30C in the summer.
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