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GrimmSpeed 15-16 Subaru WRX Stealthbox Air Intake - Red


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Inspiration for the StealthBox Intake came from internal discussions about what we wanted from an intake system for the 2015+ WRX. Of course performance is the highest priority, but at GrimmSpeed so much more than that goes into a product. We wanted an intake that purred quietly under normal driving circumstances, but would roar at wide open throttle. We wanted an intake that looked at home in the well-sported 2015+ WRX engine bay instead of a shoebox stuffed into the fender area. From here, the SteathBox was born. We took the concept one step further and referenced the F-117 Nighthawk as inspiration for the stealthy look of the GrimmSpeed heat shield. It should come as no surprise that the performance it packs is equally unique.

** 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! **

Quick Specs

+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 right here in Minnesota

This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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