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GrimmSpeed Equal Length Header — 22-25 Subaru WRX (FA24)
GrimmSpeed part 113401 is an equal length header for the 2022-2025 Subaru WRX with the FA24 engine. An equal length header design is engineered to balance exhaust pulse timing across cylinders, supporting improved power delivery and exhaust flow versus the factory unequal length header.
Key Features
- Equal length header design for balanced exhaust pulse timing
- Designed specifically for the FA24 engine in the 22-25 WRX
Fitment
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2022-2025 | Subaru | WRX | FA24 |
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | 113401 |
| Header design | Equal length |
| Engine | FA24 |
What's Included
- 1 equal length header
About GrimmSpeed
GrimmSpeed designs and manufactures performance parts for Subaru and other platforms, including intake, exhaust, drivetrain, and suspension components engineered and tested for real-world performance gains.
FAQ
What vehicles does this header fit?This header fits the 2022-2025 Subaru WRX with the FA24 engine.
What is an equal length header?An equal length header uses matched-length primary tubes to balance exhaust pulse timing across cylinders, which can improve power delivery and exhaust flow.
Is professional installation recommended?Yes, header installation and any related tuning should be performed by someone experienced with exhaust work.
Does installing this header require re-tuning?Header changes can affect exhaust flow characteristics; consult a tuner to confirm if adjustments are needed for your setup.
What material is this header made from?This header is constructed from heat-resistant material suited for exhaust manifold applications.
Will this header work with the factory catalytic converter?Confirm compatibility with your factory or aftermarket downstream exhaust components before ordering.
Does this header include gaskets?Check the packaging for included gaskets and installation hardware.
Will this header fit the previous generation WRX?No, this header is specific to the FA24 engine in the 2022-2025 WRX; confirm your exact engine before ordering.
Installation Instructions
- Support the vehicle safely and allow the exhaust system to cool before beginning work.
- Remove the factory header/exhaust manifold per the vehicle's service procedure.
- Install the GrimmSpeed equal length header with new gaskets and hardware.
- Reconnect all exhaust and sensor connections, then check for leaks and proper clearance before driving.
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