Originally Posted by ED9man
Widebody kits don't really improve aerodynamics anyways, racecars like those in the JGTC just have then so they can run wider tires and not violate the closed wheel regulation.
What makes you think that JGTC teams don't throw their cars in a wind tunnel every once in a while?
Just as an example: the Champion Racing Audi RS6 which runs in Speed World Challenge is on its umpteenth revised front fascia, each one having been tested in a wind tunnel. And there's a lot more money being spent in JGTC than in World Challenge.