They are both wet kits, in the concept sense. One just fogs in front of the tb's the other after. But I would believe that in direct port the distribution is more even than what the manifold would distribute when fogging the tb's alone. The Viper has a lot of cylinders to distibute to. The key would be making sure the jetting is around only 25-30hp per cylinder (x10 + 250-300hp shot).
I spoke to NX about a kit, after seeing BigCarrot's set up. They figured about $400 labor plus the cost of the nozzles, rails, and lines. That is if you send them a manifold. And they would jet it to your liking.
I know a lot of guys think the tb butterflies act like a fail safe in that they close if something goes wrong. But I wouldn't want to rely on that. If you wire in correctly a WOT switch, a fuel pressure safety switch, and maybe even an rpm window switch, you are going to be just about as safe with either set up.
