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A "dry" kit is just that, it ONLY injects the N2O and you depend on the computer to know that it needs more fuel and then hope it adds it and in time.
A "wet" kit injects N2O AND fuel. So there is no need to worry that the PC wont do it and do it in time. plus with a wet kit you have control of how much fuel you will be adding and then can tune it for max performance - or safety.