A wet system also injects extra gas in with the Nitrous. Totaly independent of the vehicle's own fuel system, the Nitrous kit could utilize a higher octane fuel (104 anyone?) to inject with the Nitrous. Making it a wet system.

The dry systems only inject the Nitrous, and depend on the vehicle's fuel supply to get the extra fuel. Whatever is in the gas tank is used to go with the Nitrous. When activated, the Nitrous system would also trigger something to boost the fuel pressure, or use a computer to richen the fuel mixture enough to be safe for the Nitrous.

Now there are different systems.

There are wet systems that use the vehicle's fuel system, but use the fuel that's in the fuel return line to go back and get injected with the Nitrous. And there are different ways to inject the mix. Shark nozzles, injector base nozzles and single injection nozzles among others.

Nitrous however is only used at wide open throttle, and mostly above 3K rpm. The nozzles usually have interchangeable tips, to differentiate between the powers, as in a 35hp tip, 50hp tip, 70hp tip, etc.

I could see the 3.3 being good to about 70hp, but that's a max. Other weak links would begin to show. Aluminum transmissions, t-cases and small u-joints would tend to show their condition more quickly when the juice is applied.