[JayG]

IMHO, if you push a mechanical device to its limits often, it will have an adverse effect to its longevity. This goes for other things as well like tires, brakes, water pumps, anything that with a bearing in it, etc

In plain words...
Redline your engine a lot and it will have a shorter life than if you don't redline it a lot

I'm not saying you should not drive a Porsche engine hard, just that ANY engine pushed to its limits will not last as long. Lots of things that can and will break or wear out faster. Nor am I saying your should drive it like the little Old Lady from Pasadena going to church every Sunday.

Driving hard and driving at the limit are very different. Engines specifically built for racing have lots of components changed internally as well as ancillary items that hang on the engine that were specifically designed for harder use.

Porsche put in a rev limiter for good reason, it was not for grins