WRX's vs. Corvettes
It just so happens that I own one of each, so one could probably consider my inputs to be relatively unbiased. First of all, they're both great cars.
As to speed, the Corvette (a 2001 Coupe) has considerably more power and a much broader powerband. In addition it has really good aerodynamics. The result is that the performance envelope is much wider than the Subaru. While the Subaru has much better traction, it doesn't have nearly the lateral acceletation and it is only in the hunt acceleration-wise at speeds of less than 80 or so.
In reading all these posts one gets the impression that even a modded WRX is in the same league as a Vette, when it really isn't. Yes, it's possible to get a WRX down a quarter mile in under 13 seconds, while a stock C5 will do the same in about 13.4 secs, but it's no contest after that.
Racing is more than quarter mile performance. I've run against numerous WRX's in various states of tune at the local road course and it's really no contest. They understeer too much, brakes fade, and they are only competitive powerwise only at low speeds.
Having said all this I will say that I much prefer driving my WRX around town than the Vette. It's much less affected by lousy roads, is plenty fast below 80, had good visibility, really nice control responses, stays cool, and gets better mileage around town.....worse on the freeway.
So, the cars have really dirrerent purposes. The WRX is a far better real-world performance car than the Vette, while the Vette is really very fast....like being able to accelerate well at 150 MPH.
As to the differences between Z06's and Coupes, it's not enormous. There's about a second between them up to 100 MPH and the Coupes actually run faster at the very top. Lateral acceleration differences between the two are largely due to tires and camber settiings, which are easily changed. Running at the (road) track it's almost always driver ability that determines the outcome.
Bottom line, if performance is measured by quarter mile times, a heavily modified WRX and a stock Vette aren't much different. If performance is measured by what you can use on a real road at speeds of <100 MPH, then the WRX is probably the better car. If performance is measured by what one can do in the middle of Nevada, then the Vette has it.
They're both great cars....I only with my WRX would get as good a gas mileage as the Vette on the open road.