NICS: A system used in multi-valve engines (such as the CAI8DE engine in the Pulsar NX SE model) in which there are two intake ports per cylinder. One port is open all the time. The second port opens, by way of a butterfly valve, only during high r.p.m. operation. This system provides driveability at low engine speeds and good power at high r.p.m. by maintaining high air velocity through the intake system.