http://www.rjvolksperformance.com/gallery.html
Hi Jason, big question you asked! Expensive roof too! So It's probably best left alone, but here you can see Ritchie running his Cab with the roof down, this is giving aero advantage to his folded DOWN top!! Which now looks more like a well developed spoiler to me...very clever, it will be doing much of what I mentioned above, and pulling air out from under the car to help with down force, this car has run an 8 sec, pass at 150 mph, no workmate bolted on the back either, there is always a way for the clever guys to exploit ANYTHING, the good bit is those without the instinct never Suss how the quick guys do it, we are left with the starting point for efficient high speed stability being the front, mechanically sound and with a minimum of 6* castor and air flow control to kill front lift is my recommendation, oh! and it must be fun at all times! regards, Johnny.