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well, a stock 996 3.4 engine is making 300 hp with the same cooling system, oiling system, bottom end and heads as a bolt-on modified 986 3.2 engine making 265 hp, so I don't think you are pushing any limits there. as long as the ecu can manage the mixture and timing which all evidence shows that it can.
people say these engines are built to rev, but perhaps a life spent at redline is a contributor - bits moving faster, more heat, etc. modifications tend to encourage harder driving?
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