haha love that picture. If I'm on a hotlap and i come up on a car i just assume hes a regional since hes slower than me. If i can't make a clean pass I just write that lap off.
Now how nice it would be if you could add car accessories to any car, just make gmt and have accessories .ini to put those in, compass, flag etc. One reason to prefer cars that have working brake lights
Pretty easy to tell which is which the National has 2 grooves cut into the slick while the Regional has a more traditional street tire tread. Choosing the National u can use both sets of tires depending on weather conditions..
You can see how the tires look on the configuration section of this page: http://rfactor.net/web/rf2/rf2dl/skip-barber-2000/
I am finding a huge difference in performance in the 2 cars. The National being more forgiving in the turns. Where the Regional is much more slippery on turn in off accelerator. At this point I can only put this down to Tire difference. Please correct me if I am wrong?