according to the manual when performing high speed driving one should deflate tires to 30 psi i belive. Please check for your self it says exactly what saturn recomends.
25psi is good for the track But I'm not riding on stock tires... Right now, I have Pirelli Nero M&S Tires. I like them more compared to the SP9000s. Definately more traction in a straight line (not so sure about twisties).
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