Yes.

You can add nitrous oxide as a kit to most cars.

@ OP;
Yes Nitrous exists. Lemme give you a brief explanation on how it works.
Now from basic science we know Oxygen is required for combustion.
Now No2 when introduced to an engine, is broken down to Nitrogen and more of Oxygen by heat, the presence of more oxygen in the engine causes the combustion of more fuel, at a faster rate than normal and hence release more Horse power by churning out more Rpm's.
But as u know the effex are temporary, continous use of Nitro could blow the engine.
Nitrous kits can be installed on most vehicles- but for best results GT engines (sports engines)are more prefared due to bigger air chambers and fuel Nozzles they posess which favor the Nitro combustion.

optimus-prime1:
@ OP;
yes Nitrous exists. Lemme give you a brief explanation on how it works.
Now from basic science we know Oxygen is required for combustion.
Now No2 when introduced to an engine is broken down to Nitrogen and more of Oxygen, the presence of more oxygen in the engine causes the engine to burn more fuel and release more Horse power by churning out more Rpm's.
But as u know the effex are temporary.
Nitrous kits can be installed on most vehicles.

thank you! But by your saying, is it another fuel economy? Will it reduce the 'rpm'?