To me it means that the car can run respectably at the drag strip, drive it home afterwards, take it to auto cross event w/o skidding out too often and then drive it on a couple thousand mile road trip comfortably and w/o overheating. In some ways, similar to C-5 or C-6 Vette but in case of 1st gen, retains classic styling at the core and sounds much better and gets way more style points than a typical/common Vette.
Also, somewhere in there has to be something that eminates the owners uniqueness and style. That's what I strive for in tinkering with my car but I don't like to call it Pro Touring cause that's over-used and has too often digressed to mean billet gas caps on cars with cheesy names that don't see any traffic time. Seems to me with all the popularity of racing events going on (and I think that's a wonderful twist), there is a newer breed that is strictly built for racing and could be placed in different general category. Those cars take the best of pro touring and then delete anything that adds weight or isn't essential to the mission. They also prefer to add, in many cases, unsightly spoilers that take on their own identity, yet is acceptable since competetive edge is key (function over form rules in the end). Even more interesting question is what's next. Just when it seems like it can't possibly change for the better, we get proven wrong. That's what makes the hobby interesting and dynamic. I suppose one trend that's started and will continue will be to see muscle car engines become more and more efficient/sophisticated with the help of cpus. My '07 Sierra has a 5.3L that knocks out 4 cylinders when torque isn't needed. The transition from 8 to 4 and back to 8 is seemless. I wouldn't mind that for my Camaro on a long road trip.