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I wouldn't worry about using spacers so long as it's not too excessive. Sure there's going to be more wear on the bearings. But so what? When you're autoxing or on the track you're also adding more stress on the brakes, tires, chassis, etc. Running 18" wheels adds more stress vs. 17", blah blah blah.
BTW, Porsche has a disclaimer about taking your car on the track...period; it's not just for the spacers.
And about the tire pressure issue:
It is a general concensus among a lot of the people on the Boxster racing board that Porsche's recommendation is garbage. It sets up the car to really understeer. Air up to 33F/36R and it'll feel like a different car. Having a stiff sidewall is great, but if you don't have enough air to support the car then you are risking a blowout due to stressing the sidewalls (see Ford Explorer fiasco) and damaging wheels. Run low pressure at your own risk!
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