Nitrous oxide, N2O, is a colourless, almost odourless gas that was first discovered in 1793 by the English scientist and clergyman Joseph Priestley. Priestley made N2O by heating ammonium nitrate in the presence of iron filings, and then passing the gas that came off through water to remove N2O.
Nitrous Oxide (N2O) was used as a performance enhancement back in World War II, where it was used to give Allied aircraft "emergency" boosts in airspeed and altitude. There were repeated attempts at using nitrous oxide in race cars over the next few decades, still not too many people were aware of its existence.
Then, in the 1970s Mike Thermos and Dale Vaznaian made Nitrous Oxide into a whole range of race performance enhancing products NOS or nitrous oxide systems.
Nitrous oxide is well known as laughing gas due to its intoxicated affect when inhaled. Emissions from nitrogen oxides (NOS) can be blamed for acid deposition, ozone depletion and air pollution in urban areas
In relation to LPG, NOS is much more expensive pending size of tank and how much intake is going on. Nitrous oxide systems can be purchased from any good car performance outlet.
The power that is produced by the use of NOS way exceeds that of LPG, so in my opinion I think LPG is good to have but if you want power you use NOS.