Holley's Nitrous Oxide Systems (NOS) Brand The use of nitrous oxide (N20) as a performance enhancement has been traced back to World War II, where it was employed to give Allied aircraft "emergency" boosts in both airspeed and altitude capabilities. However, with the advent of jet propulsion at the end of WWII, the government's interest in piston-powered aircraft waned. And for the most part, nitrous R&D was shelved.
There were sporadic attempts at using nitrous oxide in race cars over the next few decades, but since tor the most part it was a clandestine, closely-guarded secret, not too many people were aware of its existence.
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