Lowering your Viper isn't going to do much, if anything it'll lift just as much if not more now, and removing the chin downstanding flange won't have any effect on aero, it's not a spoiler or a deflector, it's already under the fascia.. whereas a functional splitter is forward of the fascia.
The key design criteria for a race car is a small frontal area. Like a F1 car, nose having a frontal area the size of a golf ball.
The Gen2 Viper has to contend with consuming large quantities of air in it's air gulping rad opening, and just as you consume, it has to go somewhere from under the clamshell. This is why there are the large side outlets near your door hinges, to reduce air going under the car, but it still does, so technically, a lower car will reduce the gap to exhaust the air under the car causing more lift due to higher air pressure. The Gen2 has to deal with a balanced lift; front to rear, there's no downforce produced on a stock Gen2 GTS Viper. The new 08 Viper has more venting on the hood which is smart, why not exhaust the air out the top hoping to achieve more downforce from exhausting consumed air over the hood.
Whack that downstanding chin flange off Dave, it's nothing more than a styling feature, it surely isn't going to deflect air out the sides and it surely isn't going to help reduce lift, and if anything.. it'll contribute to a smaller frontal area.
We do all sorts of aero work, as the original GTS-R wing & body we supplied, and as in the previous pic above of the flipping Mercedes, that race Viper body came out of our shop..