Through years of involvement with all forms of high performance racing, NOS has evolved into the world's largest manufacturer of performance nitrous systems. NOS designs and engineers nitrous systems for virtually anything with an internal combustion engine from stock to highly modified cars. Research and development, engineering and technical support assures you of great results from NOS. Nitrous Oxide Systems carries a complete line of easy to install, state-of-the-art nitrous systems for cars; and many of them are 50 state emission legal.