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GrimmSpeed Stage 2 Power Package [2015-2021 Subaru WRX STI]

GrimmSpeed Stage 2 Power Package [2015-2021 Subaru WRX STI]

Regular price $1,205.00 USD
Regular price Sale price $1,205.00 USD
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2015-2021 Subaru WRX STI Stage 2 Power Package by GrimmSpeed

The beauty of the GrimmSpeed Staged Power Packages is that all of the included components were designed and tested to work well together as a complete system. Instead of piecing together parts from many different manufacturers and hoping that they're design theories are compatible, consider starting with one of our excellent Staged Power Packages based on your goals!

The GrimmSpeed Stage 2 Power Package is an excellent place to start when modifying your 2015+ Subaru STI. The upgraded GrimmSpeed 3-Port Boost Control Solenoid offers more accurate and more responsive boost control and is a must when having your vehicle professionally tuned. The GrimmSpeed Intake adds an additional performance increase by reducing pre-turbo restriction, which allows your turbo to build boost more quickly and more efficiently.

The GrimmSpeed Stage 2 Power Package features the same components of the Stage 1 Package, but further increases the performance of the Turbocharger with the inclusion of the Downpipe. The divorced wastegate design of the Downpipe offers superior boost control, and is the perfect complement to the Electronic Boost Control Solenoid. Over stock, the Downpipe replaces two restrictive catalytic converters as well as increases the tubing diameter. The result is a decrease in restriction after the turbo, an increase in turbine efficiency, and will further decrease time to spool as well as increase boost pressure.


  • 3-Port Electronic Boost Controller will plug and Play into OEM Harness
  • Intake combines the advantages and eliminates the negatives of both Cold Air and Short Ram designs
  • MAF sensor location inside heat shield, isolated from engine bay heat
  • Custom reusable high flow air filter w/ integrated velocity stack
  • Downpipe constructed of high grade 304L Stainless Steel for corrosion resistance and durability
  • High flow 300 cell metallic substrate catalytic converter in the downpipe
  • Made right here in the USA
  • Straight forward 2-3 hour installation with available install guides


  • Accurate and responsive boost control
  • Improves airflow and filtration
  • Reduces pre-turbo restriction
  • Decreases turbo spool time
  • Increases exhaust flow
  • Dramatically improves performance potential

Please Note: All GrimmSpeed Staged Power Packages require a proper tune.


  • 2015-2021 Subaru WRX STI

What's In The Box?

  • 1 - 3-Port Electronic Boost Controller
  • 1 - Stealthbox Cold Air Intake
  • 1 - Catted Downpipe
  • 2 - GrimmSpeed License Plate Frames
  • Couplers. Clamps and Gaskets
  • All Necessary Mounting Hardware



  • GrimmSpeed-branded products are warrantied to the original owner against manufacturing defects in materials and workmanship for the lifetime of the product.
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