If you’re looking to amp up the performance of your 2015-2021 Subaru WRX with that H4-2.0L Turbo engine, the Injen SP1209 Short Ram Air Intake is a solid choice. I’ve had my hands on this intake, and let me tell you—it’s a game changer.
Installation? Super straightforward. You can get it set up without needing a degree in engineering. Once it’s in, your turbo engine can finally breathe properly, transforming that built-up pressure into the kind of power you’ve been itching for. We’re talking about a dyno-proven boost of up to 24 horsepower and 20 lb-ft of torque. You can actually feel the difference when you hit the gas, and the sound? It’s an aggressive growl that’ll make you smile every time you accelerate.
The heart of this system is the oversized 3.00" O.D. T6-6061 aluminum tube. It’s mandrel-bent, which means airflow is smooth and efficient—no turbulence here. Plus, it looks great when you pop the hood. Injen’s patented MR (Mega Ram) Technology also ensures that your fuel trims stay in check, so you won’t be dealing with pesky check engine lights or the need for additional tuning.
Another cool feature is the custom-designed heatshield that comes with it. This isn’t just for looks; it helps protect against under-hood heat, keeping your intake nice and cool. It’s a clean setup that fits like it was made for your WRX right from the factory.
And if you’re into aesthetics, Injen offers this intake in a few finishes: polished, wrinkle black, and wrinkle red. So you can choose what suits your ride best. Oh, and don’t forget about the Injen Technology limited lifetime warranty that backs this product. That’s peace of mind right there.
Here’s a quick rundown of what you’re getting:
Just a heads up, this product isn’t CARB exempt, so if you’re in California, you’ll need to look elsewhere. But if you’re ready to take your WRX to the next level, the Injen SP1209 is definitely worth considering.
For more details, check out the install instructions and the dyno results.
Other Part Numbers:
Injen #injSP1209P
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Subaru WRX | 2015-2021 | Base |
| Subaru WRX | 2015-2021 | Premium |
| Subaru WRX | 2015-2016 | STI |
| Subaru WRX | 2015-2021 | Limited |
| Subaru WRX | 2017-2021 | Sport |
| Subaru WRX | 2017-2021 | Sport-tech |
| Subaru WRX | 2018-2021 | 6 Man |
| Subaru WRX | 2018-2021 | CVT |
| Subaru WRX | 2019 | Raui Edition |
| Subaru WRX | 2019-2020 | Sport-tech RS |
| Subaru WRX | 2021 | EyeSight |
Injen is highly recognized in the automotive industry. The company started in 1991 and specializes in manufacturing high-quality air induction products. The company has become the go-to brand by multiple import tuners and has since become an automotive icon in the industry.
Years of ExperienceFor more than three decades, the company has created dozens of patents and thousands of new products. All of their products are dyno-tested to ensure that it provides optimum performance to the vehicle it is applied to.
Injen offers a variety of products ranging from intake systems, intercoolers, exhaust systems, and other performance parts. All their products are made out of high-quality materials and are designed by the industry’s top designers and engineers. This enables them to create products that are not only functional but adds an aesthetic value to the vehicle. Even up to now, the company never stops in improving its product. Hence, they are a favorite of tuners who wanted to have the best.
Purchase Injen Products at Vivid RacingIf you are looking for products that provide performance gains and are tried and tested, then Injen is the brand for you. They have been used by thousands of enthusiasts worldwide and have provided them high-performance products they truly deserve. The company has one of the most comprehensive lists of products that applies to most vehicles available in the market. You can never go wrong with Injen.
Visit Vivid Racing and check out their list of products that would fit your specific needs.

Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship on all intake systems excluding the filter element. Injen Technology will replace at no charge, any intake pipe considered by Injen Technology to be defective. The warranty is void if the warranty card is not returned to Injen Technology within the first 30 days of purchase. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology.s discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, nor does it cover the cost of installation or removal of the defective part or its replacement.
EXHAUST WARRANTY
Injen Technology offers a one-year warranty to the original purchaser against defects in material and workmanship on all exhaust systems. Injen Technology will replace at no charge, any exhaust system considered by Injen Technology to be defective. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology's discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, nor does it cover the cost of installation or removal of the defective part or its replacement.
AIR INTAKES AND ACCESSORIES
Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship on all intake systems excluding the filter element. Injen Technology will replace at no charge, any intake pipe considered by Injen Technology to be defective. The warranty is void if the warranty card is not returned to Injen Technology within the first 30 days of purchase. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology's discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, nor does it cover the cost of installation or removal of the defective part or its replacement. All warranty items must be sent freight prepaid with a valid RMA (Return Merchandise Authorization) number and copy of original invoice.
SES INTERCOOLERS AND EXHAUST SYSTEMS
Injen Technology offers a one-year warranty to the original purchaser against defects in material and workmanship on all exhaust systems. SES Intercooler and exhaust systems that have been installed will not be eligible for return under any circumstances. Defective parts will be replaced or repaired as deemed necessary by Injen Technology. All other warranty issues will apply as indicated under the Air Intake section. Most exhaust and Intercooler system installations may require a lift and or specialized tools. Due to the installation complexity of automotive exhaust and Intercooler systems, Injen Technology recommends that a qualified technician perform the installation. Most local Tuner or exhaust and muffler shops offer professional installation.