Quote Originally Posted by SPQR View Post
Dry kits are easier to install because you don't have to plumb-in petrol. The manufacturers claim that they are suited to street tune cars and provide a reasonable boost of up to 70 bhp. Wet kits are safer at wide open throttle as you said; as the engine is not in closed loop mode. I did warn that there is a danger to engines. Clearly this would be at WOT.
You would use N2O only during WOT, so there is not much point taking shortcuts just because the dry system is easier to install when it is clear that the ECU cannot compensate with additional fuel on its own during WOT. You would probably need a wet system for Euros running stock ECUs because all it relies on is a MAP sensor which can't tell the difference between air and N2O.