The Injen 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 T-6 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. IS Short Ram Cold Air Intake System, Part No. IS1200P, 2002-2007 Subaru Impreza WRX H4-2.0L Turbo, 2002-2007 Subaru Impreza WRX STI H4-2.0L Turbo. Short Ram Intake; Recommended for Modified WRX or w/ Turbo Upgrade Subaru 02-06 WRX 2.0L Turbo; 04-07 Sti (IS Recommended for Modified WRX or w/Turbo Upgrade)