Thanks guys. The car turned out great- this was the last one we released before going back to th drawing board on things... if you like this, wait until you see the new version
Believe it or not, the 21/20 setup drives EXCELLENT. You literally cannot tell that you are riding on such tires. I would recommend it to anyone.
That being said, the above setup is riding on 20 profile rears. We have since found a 25 profile rear that we are using now- its even better. The bonus? Pirelli uses goofy tire sizing using section width rather than tread widths. Even though the above is a 375/20/21, the new tire, a 355/25/21, is actually WIDER in actual contact patch by over an inch. Go figure... as if the 375's weren't wide enough already.
All that said... personal preference, I would not run the 20 profile on chrome lips, only black, gray, anthracite, or carbon. It makes it look like a rubber band when you have shadows- but as you can see, it all blends on darker lips.