STI Intake Kit

The Extreme Turbo Systems (ETS) 04-07 Subaru STI Intake Kit is engineered to deliver world-record proven performance by optimizing airflow and intake temperature. This kit strategically relocates the air filter to the fender well, away from the engine bay's heat, ensuring the coldest and most abundant air supply for your turbocharged Subaru engine. Built in-house with precision, the ETS intake kit features durable 3-inch stainless steel mandrel-bent piping and a 3-inch aluminum MAF housing compatible with the stock MAF sensor. The cold air intake design is paired with a high-flow K&N filter, emphasizing reliability and efficiency. The kit is manufactured in the USA, showcasing ETS's commitment to quality craftsmanship and platform-specific engineering. By improving airflow and reducing intake air temperatures, this kit enhances throttle response, increases horsepower potential, and promotes better turbo spool characteristics. It is designed as a bolt-on upgrade for straightforward installation with basic hand tools. While it fits directly onto the stock MAF sensor and requires no permanent modifications, minor trimming or adjustments may be necessary depending on aftermarket fender liners or accessories. Tuning is recommended to fully capitalize on the increased airflow and optimize air/fuel ratios for maximum power and reliability. This intake kit is specifically designed for 2004-2007 Subaru WRX STI models. It includes the intake kit, a K&N high-flow reusable air filter, a 3" aluminum MAF housing, 3" stainless steel mandrel-bent piping, mounting hardware, clamps, and installation instructions.