Before anything is said the purpose of this thread is NOT to claim one car is better than the other. But found these curves interesting and does speak to each cars intended purpose that being track vs street.

 

I've honestly never understood the NA argument of "it feels better". I completely understand the linearity argument from the NA engine and its more predictable behavior at lower revs, but on a track, you're almost never under 50% of redline. Of course, this doesn't account for lag from the turbos, and in that way the NA is more instant (and again more predictable), but the VTG's are getting soooo good.

Obviously, the GTS is being limited by its allowed boost pressure (which is exactly what all the tuners are doing - removing that lower limit), which is probably for the good considering engine internals being very different between the two engines. Although I'm sure the GTS 3.0L can handle the higher boost pressure and resulting HP, I seriously doubt it would last as long as the GT3.

It's also obvious that the GTS's turbo can't flow enough to run over ~6500 rpm... or can they? That's my bigger question - Can the turbos and heads actually flow enough to support higher revs (thus making more hp), or is this a true limit of the intake design (turbos, valves, etc). It wouldn't surprise me to learn that the GTS intake is capable, but Porsche was like "Zee GTS can't'n be maken'zee more zan zee GT3!".

In the end, it's a completely reasonable response for Porsche to simply say the limits are there to protect the engine in the GTS. But the question still eats at me like how much of that is marketing vs real engineering limits?