Injen SP Short Ram Air Intake System - Polished - 2018-2021 Subaru STI
Injen SP Short Ram Air Intake System - Polished - 2018-2021 Subaru STI
Injen
Couldn't load pickup availability
- ✔ Verified fitment & authentic brands
- ✔ Secure checkout via Shopify, Stripe, and PayPal
- ✔ Enthusiast-run support — not a marketplace
- ✔ Fair resolution on damaged or incorrect orders
Every product is sourced from authorized manufacturers or distributors. If something isn’t right with fitment or condition, we’ll work with you to resolve it fairly.
NO GUESSWORK,
JUST PARTS THAT WORK.
Let’s finish that car.
PRODUCT DETAILS
KEY FEATURES:
-
Direct Fit for:
- 2018-2021 Subaru WRX STI H4-2.5L Turbo
-
Dyno Proven Gains:
- Up to 26 hp and 24 lb-ft. of torque
-
Intake Design:
- Short Ram Air Intake Design
-
Injen's Patented MegaRam (MR®) Technology:
- Ensures substantial power gains while preserving A/F ratios
-
No Additional Tuning Required:
- No check engine lights
-
Mandrel-Bent Aluminum Tubing:
- Utilizes a large 3.250in mandrel-bent 6061-T6 aluminum intake tubing
-
Custom Heat Shield:
- Comes with a custom heat shield specifically designed for this application
-
SuperNano-Web Dry Air Filter:
- Equipped with a fully serviceable Injen SuperNano-Web dry air filter
-
Finish:
- Polished
-
Aggressive Engine Tone:
- Produces an aggressive engine tone under full throttle
-
Smooth Intake Piping:
- Eliminates restrictions, enhancing airflow
-
Manufactured in the USA:
- Pomona, California
-
Warranty:
- Backed by Injen Technology's Limited Lifetime Warranty
Note: This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.
Injen Technology Unleashes Power for Your Subaru WRX STI:
Injen Technology introduces the SP1208 performance air intake system, meticulously tailored for the 2018-2021 Subaru WRX STI featuring the H4-2.5L Turbo Engine. This advanced system is the culmination of extensive research and development, providing a proven intake solution designed to enhance power and performance in your STI. As a direct replacement for the restrictive factory airbox, the SP1208 empowers the turbo to breathe deeply, unlocking its full power potential through a simple drop-in installation. Remarkably, achieving the noted power numbers requires no additional tuning, making it an accessible upgrade.
Injen's SP Series: Pinnacle of Performance Design:
The SP series, Injen's flagship cold air intake system, stands as the pinnacle in traditional aluminum intake designs. Injen Technology holds the distinction of being the world's first tuned air intake system, with four patents on the intake tuning process. The SP series incorporates patented tuning processes, including MegaRam (MR) Technology, Air Fusion, and other innovations, establishing Injen Technology as a leader in the performance aftermarket.
Precision Design for Optimal Power and Sound:
At the heart of the SP1208 intake is the 6061-T6 aluminum air intake tube, ensuring an unobstructed path for highly efficient airflow. Painstakingly designed for optimal power levels and clean aesthetics, this intake guarantees a safe air-fuel (A/F) ratio across the power band. The SP intake features a fully serviceable Injen SuperNano-Web dry air filter, enhancing filter surface area for increased airflow and unparalleled filtration. Beyond the performance gains, the Injen SP1208 delivers an aggressive and throaty engine tone unmatched in the aftermarket, providing a complete upgrade package. For those seeking a personalized touch, Injen offers this intake system in a polished finish. As a testament to its confidence in quality, the SP CAI kit comes with the Injen Technology limited Lifetime Warranty, ensuring peace of mind for the life of your vehicle.
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
KEY FEATURES:
-
Direct Fit for:
- 2018-2021 Subaru WRX STI H4-2.5L Turbo
-
Dyno Proven Gains:
- Up to 26 hp and 24 lb-ft. of torque
-
Intake Design:
- Short Ram Air Intake Design
-
Injen's Patented MegaRam (MR®) Technology:
- Ensures substantial power gains while preserving A/F ratios
-
No Additional Tuning Required:
- No check engine lights
-
Mandrel-Bent Aluminum Tubing:
- Utilizes a large 3.250in mandrel-bent 6061-T6 aluminum intake tubing
-
Custom Heat Shield:
- Comes with a custom heat shield specifically designed for this application
-
SuperNano-Web Dry Air Filter:
- Equipped with a fully serviceable Injen SuperNano-Web dry air filter
-
Finish:
- Polished
-
Aggressive Engine Tone:
- Produces an aggressive engine tone under full throttle
-
Smooth Intake Piping:
- Eliminates restrictions, enhancing airflow
-
Manufactured in the USA:
- Pomona, California
-
Warranty:
- Backed by Injen Technology's Limited Lifetime Warranty
Note: This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.
Injen Technology Unleashes Power for Your Subaru WRX STI:
Injen Technology introduces the SP1208 performance air intake system, meticulously tailored for the 2018-2021 Subaru WRX STI featuring the H4-2.5L Turbo Engine. This advanced system is the culmination of extensive research and development, providing a proven intake solution designed to enhance power and performance in your STI. As a direct replacement for the restrictive factory airbox, the SP1208 empowers the turbo to breathe deeply, unlocking its full power potential through a simple drop-in installation. Remarkably, achieving the noted power numbers requires no additional tuning, making it an accessible upgrade.
Injen's SP Series: Pinnacle of Performance Design:
The SP series, Injen's flagship cold air intake system, stands as the pinnacle in traditional aluminum intake designs. Injen Technology holds the distinction of being the world's first tuned air intake system, with four patents on the intake tuning process. The SP series incorporates patented tuning processes, including MegaRam (MR) Technology, Air Fusion, and other innovations, establishing Injen Technology as a leader in the performance aftermarket.
Precision Design for Optimal Power and Sound:
At the heart of the SP1208 intake is the 6061-T6 aluminum air intake tube, ensuring an unobstructed path for highly efficient airflow. Painstakingly designed for optimal power levels and clean aesthetics, this intake guarantees a safe air-fuel (A/F) ratio across the power band. The SP intake features a fully serviceable Injen SuperNano-Web dry air filter, enhancing filter surface area for increased airflow and unparalleled filtration. Beyond the performance gains, the Injen SP1208 delivers an aggressive and throaty engine tone unmatched in the aftermarket, providing a complete upgrade package. For those seeking a personalized touch, Injen offers this intake system in a polished finish. As a testament to its confidence in quality, the SP CAI kit comes with the Injen Technology limited Lifetime Warranty, ensuring peace of mind for the life of your vehicle.
