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

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!

-   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's MR Technology provides massive power gains while maintaining A/F ratios
-   Includes custom heat shield specifically designed for this application
-   Smooth intake piping eliminates restrictions and improves airflow
-   Dyno Proven gains of up to 26 hp and 24 lb-ft. of torque
-   No additional tuning required and no check engine lights
-   Huge 3.250in mandrel-bent 6061-T6 aluminum intake tubing
-   Fully serviceable Injen SuperNano-Web dry air filter
-   Features Injen's patented MegaRam (MR) Technology
-   Replacement air filter part number X-1059-BB
-   Aggressive engine tone under full throttle
-   Injen Technology Limited Lifetime Warranty
-   Optional Hydroshield part number 1040BLK
-   Available in multiple finishes
-   Made in Pomona California, USA
-   Short Ram Air Intake Design
-   SP1208WB (Wrinkle Black)
-   SP1208WR (Wrinkle Red)
-   SP1208P (Polished)

This Part Fits:

Year

Make

Model

Submodel

2018-2021

Subaru

WRX STI

Base

2018-2021

Subaru

WRX STI

Limited

2019

Subaru

WRX STI

S209

2018

Subaru

WRX STI

Type RA

## Details

- **Price:** 454.96 CAD
- **Vendor:** Injen
- **Type:** Cold Air Intakes

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 454.96 CAD | In stock |

## Images

- Photo - Primary
- Photo - Mounted
- Photo - Close Up
- Datasheet
- Photo - out of package
- User 1
- User 2

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/injen-18-21-subaru-wrx-sti-h4-2-5l-turbo-sp-aluminum-series-cold-air-intake-polished)
> Updated: 2026-06-28