IMO the wet system is the only option when talking about NOS. The dry system relies on the ECM to add more fuel when it registers lean (after the NOS is injected). The delay (however small) is potentially damaging. NOT worth the risk for me just to save a couple hundred bucks. Spend the money to do it right and you won't have to wonder if you are having a lean condition. I have blown a V8 with too much NOS and not enough fuel, expensive mistake. If you decide to get NOS try a 40 shot and see how you like it, the speed shops here don't recommend anything over a 60 shot for a stock internal motor. Also you can look into a NOS controller, i think that Schnitz makes one, it may help.