Read
this from Motor Trend on the V6 mustang.
Cliffs: 5.1s 0-60, 13.7s @ 102 quarter mile, 0.96gs skid pad. Those strike me as sports car numbers.
Yes, it is configurable. Being configurable is great because people can make the car suit their needs, rather than the other way around. Does this make it not a sports car? No, I don't think so. You can just configure the percentage of hardcore sports car that suits you. From base-line V6 to Laguna Seca Boss 302.
I think the reason we are all getting hung up is we are looking at it two different ways. I know there are many people that think a sports car is defined not by the numbers, but by the design intent. The V6 mustang might have "sports car handling", but it clearly wasn't defined with performance as the first criteria. Old sports cars have shitty numbers, but that doesn't make them any less sports cars.
Something like a Miata might not even have as good numbers, but its clearly designed from the start as a sports car. You sacrifice creature comforts and large size to gain better handling. That's its common link to Ferrari and Lotus, and what separates it from an Audi or BMW.
Something that weighs near 4000 lbs and can lavishly seat 2-4 people is not a sports car by our old stuck-up definition, even if it does post good numbers and handle great
Just because modern sedans and coupes (and sports compacts) are approaching levels of performance that used to be defined as sports car, doesn't make them sports cars
If it's not a sports car from the factory, IMO you can never make it a sports car. Making my Saturn S-series handle great and do a faster 0-60 is never ever going to make it a sports car.
I'm not trying to push this definition on anyone- its just the way I look it at. I would love to own a new mustang, but I don't think I myself would refer to it as a sports car. I think of it as a class of vehicle reserved for small comparatively light vehicles that are designed with performance in mind first