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GrimmSpeed Stage 3 Power Package [2015-2019 Subaru STi]

GrimmSpeed Stage 3 Power Package [2015-2019 Subaru STi]

Regular price $2,090.00 USD
Regular price Sale price $2,090.00 USD
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2015-2019 Subaru STi Stage 3 Power Package by GrimmSpeed

The beauty of the GrimmSpeed Stage 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 their design theories are compatible, consider starting with one of our excellent power packages designed to work as one unit.

The GrimmSpeed Stage 3 Power Package has everything you need to capture the power you are looking for in 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 Catted Downpipe replaces the restrictive OEM Downpipe and makes your engine exhaust gas flow smoother and faster.

The GrimmSpeed Stage 3 Power Package features the same components of the Stage 1-2 Packages, but further increases the performance of the engine with the inclusion of the GrimmSpeed Top Mount Intercoooler, Splitter and Heatshield.


  • 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
  • High-Density, High-Flow Intercooler Core optimizes heat transfer and minimizes flow restriction
  • Made right here in the USA
  • Straight forward 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
  • Improves system cooling and minimizes restriction

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


  • 2015 - 2019 Subaru STi

What's In The Box?

  • 1 - 3-Port Electronic Boost Controller
  • 1 - Stealthbox Cold Air Intake
  • 1 - Catted Downpipe
  • 1 - Top Mount Intercooler
  • 1 - TMIC Splitter
  • 1 - Turbo Heat Shield
  • 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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