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GrimmSpeed Stealthbox Intake 2015-2021 WRX


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Pipe Color
  • Copious amounts of research and development led to the creation of the GrimmSpeed Stealthbox intake for 2015-2021 Subaru WRX. GrimmSpeed wanted intake that purred quietly under normal driving circumstances, but would roar at wide open throttle; one that looked at home in the well-sorted 2015+ WRX engine bay instead of a shoebox stuffed into the fender area. From here, the SteathBox was born. GrimmSpeed took the concept one step further and referenced the F-117 Nighthawk as inspiration for the stealthy look of the heat shield.


    • Claimed +32wtq (14.3%) and +21whp (9.6%)
    • Designed in CAD - Perfect mating with the factory turbo and ram-air scoop
    • Low bend angle aluminum tube - Minimize restriction and maximize performance
    • Shielded MAF sensor placement - Protects MAF from heat, which increases accuracy of readings
    • Made in the USA - Manufactured in Minnesota

    ** INSTALLATION NOTE: Take care to install the air filter onto the intake tube properly. Push the filter onto the tube no more than 1" before tightening the clamp. This will ensure that the velocity stack within the filter is allowed to function properly! **

    NOTE: As with any intake for the 2015+ WRX, ECU tuning is required after installation to maximize gains and safety. DO NOT install and use this intake without a custom ECU map created for the intake.

    Fits all 2015-2021 Subaru WRX.

  • SKU#: 10478RE, 10478JE

    Shipping Weight: 20.0 lb

    Supplier: GrimmSpeed

    Category: GrimmSpeed, Intake Systems