Nitrous Oxcide Intercooler kit For supercharged or turbo applications where nitrous is not an option, NX offers another alternative, the “N-tercooler”. Using either nitrous or CO2 this unit can reduce air inlet temperatures dramatically. In a recent dyno test, a turbocharged Honda, equipped with an NX “N-tercooler ”, increased its baseline by an astounding 52 horsepower! If it makes horsepower, it must be Nitrous Express!