Description
Built around the requirements of 2000-2003 Subaru WRX (EJ20) / 04 STI Exhaust, this Extreme Duty exhaust valve family gives engine builders a focused way to select the dimensions their cylinder-head combination calls for. The parent listing is distinguished by Part #11139-8, which should be cross-checked against the rest of the engine combination.
If the 2000-2003 Subaru WRX (EJ20) / 04 STI Exhaust cylinder head has been ported, fitted with oversized seats, or changed from its original valvetrain layout, confirm the required valve measurements after machining rather than using a stock-size assumption.
Key Product Details
- Application: 2000-2003 Subaru WRX (EJ20) / 04 STI Exhaust
- Manley Series: Extreme Duty
- Valve Position: Exhaust
- Title Specification: Part #11139-8
- Manufacturer Part Number: 11139-8
Package Quantity
Set of 8 valves. The selected configuration is supplied as a 8-piece valve package. This quantity applies to the selected Manley SKU family shown on this product page.
Selection & Fitment Notes
Use the finished cylinder-head setup as the authority for selection. Oversize valves or alternate lengths may require machining and can affect installed height and valvetrain geometry.
Professional engine assembly and measurement are recommended. Product specifications should be confirmed against the selected Manley part number and the requirements of the exact engine build.