GrimmSpeed Stage 1 Power Package Red – 2015-2021 Subaru STI

GrimmSpeed Stage 1 Power Package (Red) , 2015-2021 Subaru WRX STI

The GrimmSpeed Stage 1 Power Package for the 2015-2021 Subaru WRX STI bundles GrimmSpeed’s most impactful bolt-on modifications for the EJ257 engine into a single purchase. Rather than selecting individual components, the Stage 1 package provides a validated combination of parts that work together to produce the maximum performance improvement from the foundational intake, exhaust, and airflow modifications.

DETAILS

• Platform: 2015-2021 Subaru WRX STI
• Engine: EJ257
• Bundled bolt-on performance package
• Includes GrimmSpeed intake, TMIC (or FMIC), and intake components
• Significant power and response improvement over stock
• Color: Red
• Validated component combination , parts work together as a system

The Stage 1 package is built around the modifications that produce the most noticeable improvement per dollar on the EJ257 platform. The combination typically includes the cold air or StealthBox intake, upgraded intercooler, and supporting intake components , the modifications that reduce restriction in the intake and charge air path and produce the largest gains in throttle response and power delivery.

Buying the Stage 1 package rather than individual components ensures the parts are compatible, saves money over individual purchases, and gives the 2015-2021 Subaru WRX STI owner a clear starting point for their build. GrimmSpeed validates these combinations on the actual platform rather than selecting parts independently.

What’s in the Box

• See individual components included , varies by package configuration
• Hardware for all components
• Installation instructions

Why Choose GrimmSpeed

GrimmSpeed has been engineering performance parts for Subaru platforms from their Portland, Oregon facility since 2003. Everything they make is designed around real-world use , their engineers drive the same cars their customers drive, which means product decisions are made with genuine platform knowledge behind them. GrimmSpeed designs parts in-house, sources quality materials, and validates fitment on the actual application before release. The result is parts that install correctly the first time, perform as advertised, and hold up under the conditions Subaru owners actually subject their cars to. Whether it is a critical engine component or a cosmetic upgrade, the same attention to detail and fit quality applies across the catalog.

The RallySport Take

The Stage 1 Power Package is what we recommend for 2015-2021 Subaru WRX STI owners who want a significant performance upgrade and want it done right with validated components. It covers the intake and charge air modifications that produce the most noticeable difference on the platform and sets the foundation for further modifications. Fits the 2015-2021 Subaru WRX STI.

Fitment