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Ranbar touched upon a real good point about keeping the revs low when the engine is cold. You will significantly shorten the life of the engine if you rev it high before it has a chance to warm up properly. I learned the hard way when I broke a lifter in my old 528i. The proper operating temp is around 185 degreees. Before the engine reaches this temp, you should not exceed 4,200rpm per Porsche. Consequently, this is also the rpm limit during "breakin" period. After the engine is warmed up, don't be afraid to rev it high from time to time...this is when the boxster starts to wake up.
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