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The over-rev ranges change from year to year and model to model. This is not in the service manual. You won't find anyone in Porsche handing out the info on exact RPM numbers.
That being said:
I have one customer with a 997 GT3 that pulled 2nd instead of 4th. He hit Range 5, and obliterated his aftermarket flywheel and bell housing. We pulled the trans, installed a new flywheel and clutch- welded up the bell housing- and compression tested the engine. All ok. He now has about 10,000 more miles on it than when it happened. Most of that is track miles.
You wont find a stick shift Porsche with 0 range 1 revs. You hit range 1 anytime you hit the rev limiter. Everyone does it. Range 2 isn't scary either.
Range 4 or above, and I would be worried. But even so- like I said, I have seen a range 5 live to tell the tale!
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