Key Features & Benefits – HKS SQV4 style sequential blow off valve with Subaru adapter, silver
The HKS SQV4 style sequential blow off valve with Subaru adapter, silver is a vacuum-operated BOV used to vent excess charge pressure on throttle lift in turbo setups. The kit includes a Subaru adapter flange with a bolt-on mounting pattern.
As a compatibility anchor, the Subaru flange is stated for Subaru WRX STI 2002–2007 (GDB/GDA) applications, and it can be used around top-mount intercooler layouts when the mounting points and routing match. For other model years, compare flange pattern and opening dimensions before fitting.
When is this useful?
It is useful when you want a flange-adapter BOV solution on a Subaru WRX STI 2002–2007 setup and you need the mounting points to line up while keeping a clean vacuum reference connection.
Technical specs
- Product type: Sequential blow off valve (BOV) with Subaru adapter flange
- Style: HKS SQV4 style
- Brand: Epman
- Colour: Silver
- Vehicle compatibility: Subaru WRX STI 2002–2007 (GDB/GDA, EJ20/EJ25)
- Adapter flange key dimensions: Main opening 55 mm; inner diameter 28.5 mm; hole spacing 101 mm; mounting hole 9 mm
Selection & installation tips
- Mount pattern check: Compare the flange 101 mm hole spacing and 9 mm holes to your intercooler/stock flange mounting points.
- Opening size: Confirm the sealing face and port match the 55 mm and 28.5 mm dimensions in your setup.
- Vacuum line routing: Use a stable vacuum source and keep the hose kink-free and leak-free.
- Clearance: Trial-fit to ensure the valve body clears the hood, piping, and wiring/hoses through engine movement.
- Leak check: After installation, check sealing and fasteners during load changes and re-check after initial running.
Before fitting, verify Subaru-side mounting, flange dimensions, and vacuum routing, then match them to the specs above to ensure proper fit in your setup.
