I am not trying to disagree, but I can NOT believe everyone who has done a belly pan is just imagining the results. I will trust that the theory on improving the belly pan is accurate, or plausible, but to say that a belly pan does nothing? I can't believe that one bit. Too many people have done too good of testing for me to believe that a belly pan is worthless unless it has dimples or whatever.
And a flat belly pan is used to slow the cars down? I can't believe they would do anything to slow the car down. They have breaks, if they want to get into the lead, they need to get their the fastest, hold the turns well. If they wanted to make aero slow downs, it could be Bugatti style with flaps, which has been around for years. What is your take on the Ford GT underbody? That is what I want to build for my vehicle. Sub optimal?
Is that picture from Gran Turismo? I love that simulator