N20 without a doubt
(btw NOS is a name of a brand, a fairly sh!tty brand when it comes to nitros, so i would sugest calling it boost, bottle, squeese, nitros or N2O (the chemical name for it))

Calling it NOS is just 2Fast 2Furious! You might find your self putting on a Aluminium GT wing on your hatchy and be racing people for the "pink slip"
