I'm glad Ricky mentioned A/C , project Superbeater also has A/C, in fact I repaired it so I would have it working down here in Fla. Also comments on weight saving in body panels is spot on, When you start looking at carbon fiber, there is race C/F and street C/F. the race stuff is flimsy and not very good finish, it has to be that way because the original body panels are so ligh to begin with, that it's difficult to make anything lighter. The street stuff is finished off, but it is also about twice as much weigth as the original panels. I was searching for comments AJ made about the cambered rear, I don't really know how to explain it, but the cambered rear, itself doesn't make the car faster, what it does do is allow further changes to the cars setup and that is what makes the car faster, being able to adjust camber and other perameters, in racing there is no magic part, there are simply parts that allow you to more finely tune the car. This diff is a great product, and very robust, AJ's Mustang has hit every curb in the universe, and had the chassis drop by several feet in some places, and the diff never complained a bit.
The limiting factor will always be tires, 200 TDW is only so good, not matter what you do. The Goodyear supercar 3s that we ran in WRL were great, they had the same lap times at the end of the race as the beginning, that being said, the bad part is, they had the same lap times at the end as in the beginning. so whatver chassis tweaks you could do , was limited by the tires. Going full slick will do 4 things, 1. it will be more expensive, 2. you will need more of them, 3. a sticker set of tires will mask a ton of bad setup decisions.. at least for a few laps, 4. they will drop off over time. try to find a class with the 200TDW IMO and stay there for awhile.