Dry systems inject a smaller amount of nitrous into the engine without installing some kind of fuel augumentation. They were developed for todays fuel injected cars to give a little power without maxing out the vehicles fuel delivery system.
The NOS "DRY" kit uses a controller to enhance the factory fuel system to its limit in order to achieve the 80 hp gains that the dry kit offers.
Dry kits were not in existance until fuel injected cars hit the streets. With carburated engines that use low pressure/high volume fuel delivery, an abundance of extra gasoline was available to supplement nitrous. It is not easy to tap into the high pressure/low volume fuel systems of fuel injected cars and most of them(especially the viper) do not have the extra fuel system capacity to lend fuel to supplement the needs of a 200+hp nitrous kit. That is why we introduced propane.
There are other methods of introducing extra fuel necessary to achieve higher power levels, but keep in mind that the viper fuel system is limited to about 550 hp.
Everyone has their preference. I like propane, it burns cool and is higher octane than any racing gas on the market, no noisy fuel pumps, no fuel cells, and gasoline smell in the car. After 60 or so 1/4 mile passes I take the bottle with my Bar-B-Q grill tank to the local RV store and get it filled for a dollar. But thats my opinion, and we all know what opinions are like..........LOL.
Good luck to you all with your search........Albert has a very fast car and can definately offer a powerful alternative to nitrous/fuel delivery.
Tom
Http://btrviper.com