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Injen 18-21 Subaru WRX STI H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle Black

Take your Subaru WRX STI to the next level with Injen's flagship SP series cold air intake system. Engineered with Injen's patented tuning process, including MegaRam (MR) Technology and Air Fusion, this intake system provides unparalleled performance gains.

Featuring a fully serviceable Injen SuperNano-Web dry air filter, this intake system provides increased filter surface area for greater airflow and unbeatable filtration. Plus, the aggressive and throaty tone is unmatched in the aftermarket.

  • Patented tuning process for optimal performance gains
  • Fully serviceable Injen SuperNano-Web dry air filter
  • Aggressive and throaty tone
  • Injen Technology limited Lifetime Warranty
Make Model Year Type
Subaru WRX STI 2018 Base
Subaru WRX STI 2018 Limited
Subaru WRX STI 2018 Type RA
Subaru WRX STI 2019 Base
Subaru WRX STI 2019 Limited
Subaru WRX STI 2019 S209
Subaru WRX STI 2020 Base
Subaru WRX STI 2020 Limited
Subaru WRX STI 2021 Base
Subaru WRX STI 2021 Limited
In 1988, a young entrepreneur named Ron Delgado was working late into the evening – trying to find a better way to polish products for his family “job shop” business. At the time, most machines only polished along flat surfaces. But when Ron had the idea for a multi-axis machine – which could polish better and faster than anything he had used before - he was determined to make it a reality. What began as a mission to perfect the art of polishing soon grew into a full-fledged quest to develop industry-changing design and manufacturing solutions. And, in 1991 – as the demand for high quality aftermarket air induction products began to reach scale – Ron knew he had found an opportunity to make his mark on an industry he loved. Launching Injen – with a pioneering patent that allowed enthusiasts to achieve better performance from their vehicles without annoying “Check Engine Lights” (CEL’s) – Ron and his team have never waivered from their commitment to innovate and deliver products that solve for the increasingly complex nature of vehicles brought to market.
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