GrimmSpeed STEALTHBOX INTAKE For 15-21 SUBARU WRX (Black/Red)

** 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

The GrimmSpeed intake produced an additional 32ftlb (14.3%) at 3000rpm and 21whp (9.6%) at 5500rpm, with healthy gains all the way across both curves. As mentioned before, the AFR and Boost curves are also included to demonstrate that the gains shown are from the intake alone, not the manipulation of other variables.

As with any intake for the 2015-21 WRX, tuning is required after installation to maximize gains and safety.

GrimmSpeed Stealthbox Intake Kit Includes

• 1x CNC bent intake tube w/ MAF flange
• 1x GrimmSpeed high-flow dry air filter
• 1x Aluminum heat shield
• 1x 12" MAF harness extension
• 1x Silicon hump coupler
• 3x Stainless steel worm gear clamp
• 3x Rubber gasket material cut-to-length
• 2x MAF sensor machine screws

Fitments

• 2015-2021 Subaru WRX

** 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! **

Install Guide

Written - 2015-21 WRX GrimmSpeed Intake Installation Guide