| There are a lot of choices when looking into a nitrous oxide system. Starting with wet or dry Nitrous Oxide. Wet nitrous is sprayed as an atomized liquid directly into the intake manifold where the gasoline is mixed with air. The dry system is generally sprayed into the intake piping somewhere, as a gas. The choices for all of the manufacturers out there make a decision difficult. One system which I've had personal experience with, is the Zex smart Nitrous system. It's easy to hook up and automatically engages the flow of nitrous to the engine computed by it's own little box. But it is more expensive. NOS and Nitrous Xpress as well as Edelbrock all have good systems, but they don't offer all the same types of parts. Some come with kits, others just sell the basic stuff. Wet systems are manufactured to produce more power, but also puts more strain on the engine. I would reccommend the dry system for our civic, just because it's easier to install and doesn't run the risk of overloading the engine. As far as I know the wet system need to be mixed properly before entering the engine, and I think most wet kits come with the appropriate hardware to do so. | 
