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Its not illegal if installed properly. CARB kits are available from NOS but they usually only make them for mustangs and camaros. YOu would really have to check your local law authority to see if its okay. I pass smog test fine here in TX. We barely even care for pollutants.
HalTech - Is that the old "Top Gun" nitrous company? I helped a friend install one of their kits on his race car a few years ago & it was designed with the 2 stage solenoid/jetting like U were looking for. His squeezed 75 hp off the line & the second stage was good for an additional 125 hp at 3k rpms+. Nice kit & well thought out. Top Gun was from Texas but I don't recall exactly which city. BTW - that price of $599 is the same as the Nitrous Express kit for the GS4.
i think you may be right the topgun nitrous company could be tnt i am not sure its out of tyler tx. I like them over the other kits do to the fact that its so complete,. They even give you the NHRA blow down tube which is required to be in all cars running NOS.
IMO & IME, the wet system is the safest system as it does a better job of assuring that the extra gasoline is atomized with the nitrous. By using a "fogger" nozzle & tapping into the fuel system feed rail, U help eliminate the chance of an injector sticking. The dry system relies on the factory injectors for the fuel enrichening by cycling them more frequently. This is what concerns me - if the factory injectors are already running static ( never closing - typical for anything over 85% duty cycle ) as they probably are for those of us with intake/exhaust mods, then how can they flow more fuel? Even by increasing fuel pressure, U can still force only so much liquid through a fixed orifice. The dry system's advantage is that it supposedly will yield more horsepower. Without question, the direct port setup is the best - assures equal distribution of nitrous/fuel per cylinder & looks FINE!! This could be done with one of NOS's custom plumbing kits - basically bending tubing once the intake runners R tapped for the nozzles. Maybe if I win the lottery??
there is no way to runa dry kit on our cars "400s" due to the lack of a fuel return line. Wet is the only way to fly...
Dry kits are only safer due to the fact they cannot back fire threw the intake manifold. And yes everything you said about the injectors etc on a dry kit is true..
you tap the intake plenum at each runner approx 3-4inchs from the intake manifold flange. it runs with brass lines and then that connects to your solonoids which then coonnects to your fuel and nos lines.