Originally Posted by DeeezNuuuts83
With the Corvette example, you're comparing trim levels. Obviously the base Corvette is not going to get the same engine as the six-figure ZR1. With the Camaro getting a detuned variant of the LS9, it has different hardware, like the supercharger is different from what I remember, rather than Chevy giving it pretty much the same engine but a less aggressive tune, which is the case with Porsche, unless I'm mistaken. They even did it between the Boxter and Cayman models, where the Cayman has a tiny edge in output to still place it "above" the Boxter, even if it's only by a slight margin. Again, it's not really a difference in hardware, just the tune (literally de-tuned only, as opposed to being given lesser parts).
There's no incentive to releasing your top end product if your cheaper product is selling just fine. Right now the Cayman and Boxster sell well enough that there's no need to do anything about the power.
Giving it more power entails more costs of components, warranty fixes, etc. Until someone starts giving Porsche a run for their money in that segment, I don't see it happening. But I guarantee that if it ever happened you'd see a Cayman GT3 tomorrow, although a bit dusty because it's been ready to go since 2002.