IS Intake System The IS series is a traditional, underhood intake system that is placed in the stock location of the factory air box system. Each system is built from 6061, T6 aluminum alloy to ensure the lightest design possible. Every IS system is certified or pending by the California Air Resource Board and backed by Injen Technology's limited lifetime warranty. A. 6061 Aluminum Alloy B. Tig welded aluminum vacuum ports C. All stainless steel clamps and Injen's specialty hose D. Injen's urethane Air Filter with built in velocity stack