since nitrous cools down the engine also i wonder if you ran nitrous and water.met injection at the same time would it be a big difference in hp increase from just running one and what type of stress would it cost on freshly built streetported motor stock twins at 12+ psi with 3mm seals

 

nitrous is a very different animal than AI
yes you can run both together but they are different.

Nitrous = more oxygen in the combustion chamber
Meth/water = more fuel, octane and/or detonation control

Set up and tuned right im sure it would work well and be reliable. done wrong youll blow your motor