I've pondered these sorts of questions over time as well. But keep in mind that while (for example) a C6 vette is a quicker car, it's also just inherent less stable. If you're the world's best driver, you're going to make better lap times in that C6 all other things being equal. But the Z just has a little better feel. It gets loose a little more gradually, allowing you to explore the limits of the car without quite as much risk of sudden catastrophe.
In my current thoughts, I really like the Z as a platform, but it could use a little more power. Probably the sweet spot is to put a quality SC system in the Z and go for a very mild PSI and tuning on it, say shooting for the ballpark of 375-400 RWHP peak, with a relatively flat curve. I think this is more or less the direction Travis is shooting for with his track car's new SC setup as well. I think a Z + mild SC is going to be more fun and more forgiving than a beast of a C6.
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