I have done it, it will very quickly destroy your engine though. There are a few problems that you would come across. first of all you need to understand the way that NO2 or nitrous oxide works, a molecule of air is composed of roughly 70% nitrogen, 20% oxygen and 10% other gases. A molecule of NO2 is composed of 33%nitrogen, and 66%oxygen. This means that on the intake stroke you are drawing in a lot more oxygen, therfore you can use more fuel therefore increasing power, also since the NO2 is stored as a liquid, and discharged as a liquid, when it changes into a gas, it rapidly cools the incoming fuel/air mix, meaning you can cram even more of this stuff into the intake stroke. Now, here is where the problems erupt, When the NO2 is dishcharged, it needs more fuel other wise it leans out the mix too much and power suffers. So first off you need a way to inject more fuel, either you can richen the needle valve, or have a seperate injector which is the way cars use NO2. So, you need a solenoid to discharge the NO2 and either a servo to open up the needle valve, or a pump and servo to pump more fuel into the carb. This is where you get a break. You can get NO2 in little 8gram bulbs for refillible whipping cream containers, this stuff is food grade so it is very pure. Now my setup was a very simple one, my fuel richening was done by me opening the needle valve, and the NO2 discharge was done by me opening a valve that was in the injector line, this boosted my .40LA running on 45%nitro to 21k rpm spinning an 11x7 prop. total runtime at this speed was about 10 secs then my glow plug melted. So go for it it is possible, but will be expensive. The ultimate thing would be to have your own machine shop or access to one and make your own parts, that would be able to handle the stress.