If you’re looking to enhance your 2015-2021 Subaru WRX, the GrimmSpeed Red StealthBox Cold Air Intake is a standout choice. Designed with both performance and aesthetics in mind, this intake system brings a blend of power and style to your engine bay.
The inspiration behind the StealthBox was simple: to create an intake that not only delivers impressive performance but does so with a refined touch. With gains of +32wtq (14.3%) and +21whp (9.6%), you’ll feel the difference as you hit the accelerator. Customers have noted that the intake provides a satisfying roar when pushed to the limit, yet remains pleasantly quiet during everyday driving.
Crafted using CAD technology, the intake is engineered to fit perfectly with the factory turbo and ram-air scoop. The low bend angle aluminum tube minimizes airflow restriction, allowing for maximum performance without compromise. The shielded MAF sensor placement protects critical components from heat, ensuring accurate readings and optimal performance.
Quality is paramount at GrimmSpeed, and this product is proudly made in the USA, ensuring that you receive a high-standard item that you can rely on.
Keep in mind that tuning is required for this intake system, as it is not compatible with the factory tune or any off-the-shelf maps. This means you’ll need to have a custom tune to fully enjoy the benefits of the StealthBox.
“I installed the GrimmSpeed StealthBox on my WRX, and the difference is night and day! The sound is amazing, and the power increase is noticeable. It really looks great under the hood too!” - John D.
“This intake not only performs well but fits perfectly. I love how it looks, and the installation was straightforward. Highly recommend!” - Emily R.
Other Part Numbers:
GrimmSpeed #GRM060067
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
2015-2021 Subaru WRX |
WRX | 2015-2021 |

Grimmspeed is an automotive aftermarket company that was founded in 2006 by Justin Grimm. They specialize in creating parts for the exhaust system for various automotive vehicles. Grimm has always had this passion for cars and had always wanted to improve his vehicle’s performance. After numerous trials, he was able to perfect his craft and later on decided to turn it into his career. Today, they have become one of the leading brands when it comes to producing high-performance exhaust systems.
Expanding their Product OfferingThe company initially manufactured parts for Subaru. But as the company expanded, they started offering parts for other brands such as Ford, Mitsubishi, Hyundai, and Mazda. They now offer parts such as intercoolers, intake, exhaust, engine pulleys, gaskets, boost controllers, phenolic spacers and so much more.
Continuous Product DevelopmentGrimmspeed never stops in finding ways to produce innovative products and is always on the push to keep their products up to date. With the rapid change in automotive technology, it is a must that their product is able to adapt to this change for it to satisfy the demand of its users. This is the reason why the company has gained the trust of many tuners all around.
Purchase Grimmspeed Product at Vivid RacingBuilt by an enthusiast for fellow enthusiasts.
If you want a product that is designed to improve the performance of your vehicle, then Grimmspeed is the brand for you. To know more about Grimmspeed, visit Vivid Racing and check out their list of products that would fit your specific needs.