You guys ever see how a Gumpert makes a side curtain using the body work?
It creates side curtains using multiple mini-tornadoes created by the body work. How clever is that? Functional and yet not even visible to the naked eye!
This is the type of thinking we need on our body kits. More function - less rice. If the car evolves using ideas like this - we will all be better off in the long run.
On the other hand - it is important to differentiate between street and track. Some things will only work in one role.
You have to ask yourself questions like "Why do I want more downforce?" Is it because you are tracking? Is it because you want it to look cool? Maybe both? Fact is - unless you have a clear vision of what you are trying to accomplish - you run a high risk of screwing the balance of your car up. You and your friends might think it looks awesome but the penalty might be that it doesn't autocross as fast as a stock BRZ.
The only thing you need to do to a BRZ to get an "STI" is put on some FI or go e-85 or both and have a good tuner involved. Done.
There is more to the story with this car and it's history and future. There is one thing for sure - they hit a hotspot with the base car and they priced it to let us do mods that make the car truly special. Even if they did come out with an STI version - most people would probably still get a base or used base and mod it themselves.