Injen Short Ram Air Intake | 2018-2021 Subaru WRX STI (SP1208)


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2018-2021 Subaru WRX STI Short Ram Air Intake by Injen

Injen Technology has done it once again with this new short ram air intake for the 2018-2021 Subaru WRX STI Equipped with the H4-2.5L Turbo Engine. The Injen Technology SP1208 performance air intake system is the result of countless hours invested in research and development to provide a proven intake system designed to add power and performance to your STI. The Injen Technology SP1208 intake system is a direct replacement for that restrictive factory airbox and provides a engineered solution that allows that turbo to breathe deeply and produce it’s full power potential with a simple drop-in install. To top it all off, no tune is required to get the power numbers noted!

The SP series of cold air intakes is Injen’s flagship system in their lines of traditional aluminum cold air intake systems. Injen Technology is the world’s first tuned air intake system and holds four (4) patents on the tuning process of an intake system, something no other manufacturer can claim. The SP series of cold air intakes feature many of Injen Technology’s patented tuning process, including MegaRam (MR) Technology (Patents 7,359,795 and 7,669,571), Air Fusion (Patent 7,721,669), and many other innovations that keep Injen Technology at the forefront in the performance aftermarket.

The soul of the SP1208 intake is found within the 6061-T6 aluminum air intake tube that provides a smooth uninterrupted path for highly efficient airflow. The Injen Technology engineers have painstakingly designed the intake to provide the highest levels of safe power, along with clean aesthetics that will impress every time you open your hood. In addition to the impressive power increase, the Injen team has ensured that a safe Air fuel (A/F) ratio has been maintained throughout the power band.

Additionally, this SP intake includes a fully serviceable Injen SuperNano-Web dry air filter, which provides increased filter surface area allowing for greater airflow and unbeatable filtration. If that's not enough, the Injen SP performance intake provides power you can hear and feel! This intake provides an aggressive and throaty tone that is unmatched in the aftermarket. Want to add that personalized touch to your intake? You’re in luck, as Injen also offers this intake system in multiple finishes. To top it all off, this SP CAI kit includes the unbeatable Injen Technology limited Lifetime Warranty!


  • Short Ram Air Intake Design
  • Features Injen’s patented MegaRam (MR®) Technology
  • Injen’s MR Technology provides massive power gains while maintaining A/F ratios
  • No additional tuning required and no check engine lights
  • Huge 3.250in mandrel-bent 6061-T6 aluminum intake tubing
  • Includes custom heat shield specifically designed for this application
  • Made in Pomona California, USA


  • Dyno Proven Gains of up to 26 hp and 24 lb-ft. of torque
  • Fully serviceable Injen SuperNano-Web dry air filter
  • Available in multiple finishes
  • Aggressive engine tone under full throttle
  • Smooth intake piping eliminates restrictions and improves airflow


  • 2018-2021 Subaru WRX STI

What's In The Box?

  • 1 - Short Ram Air Intake



  • Injen's Standard Limited Warranty

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