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GrimmSpeed - Subaru 15-21 STI - Stage 3 Power Package

GrimmSpeed - Subaru 15-21 STI - Stage 3 Power Package


Regular price $2,090.00 USD
Regular price Sale price $2,090.00 USD
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Shipping calculated at checkout.

This item has been discontinued by the manufacturer.

Everything you need in one package!

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 responsive boost control and is a must when professionally tuned your vehicle. The GrimmSpeed Intake increases performance by reducing pre-turbo restriction, allowing your turbo to build more quickly and efficiently.

The GrimmSpeed Catted Downpipe replaces the restrictive OEM Downpipe and makes your engine exhaust gas flow smoother and faster. 

It's important to note that all GrimmSpeed Staged Power Packages require a proper tune.


Stage 3 Package Components

  • GrimmSpeed Cold Air Intake System
  • GrimmSpeed 3-Port Electronic Boost Control Solenoid
  • GrimmSpeed Catted Downpipe
  • GrimmSpeed Turbo Heat Shield
  • GrimmSpeed Top Mount Intercooler
  • GrimmSpeed TMIC Splitter


Stage 3 Package Features

  • Decrease Spool Time - Lower intake restriction and better boost control
  • Plug and Play into OEM Harness - No splicing wires like other BCS solutions
  • High-Density, High-Flow Intercooler Core - Optimizes heat transfer and minimizes flow restriction for turbo Subarus
  • Hybrid Cold Air/Short Ram Design - Combining the advantages and eliminating the negatives of both traditional intake designs
  • Custom reusable high flow air filter - Integrated velocity stack entrance smooths incoming air
  • Stainless Steel Construction - The downpipe is constructed of high-grade 304L SS for corrosion resistance and durability
  • Made in the USA - in Minnesota



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



  • 2015 Subaru STI
  • 2016 Subaru STI
  • 2017 Subaru STI
  • 2018 Subaru STI
  • 2019 Subaru STI
  • 2020 Subaru STI
  • 2021 Subaru STI



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