The Chevrolet Camaro ZL1 has become really popular for HPDE, as a daily driver and a good tool for terrorizing the streets in general. K&N Engineering now makes a cold air intake for the ZL1 that is designed to improve throttle response and engine sound. K&N guarantees it will make more horsepower through its free-flowing carbon fiber tube and cone-style filter. The system installs in less than 2 hours with ordinary hand tools. $676.