HKS Super SQV4 Blow Off Valve - 2002-2007 Subaru WRX / STI / 2006-2008 Forester XT
HKS Super SQV4 Blow Off Valve - 2002-2007 Subaru WRX / STI / 2006-2008 Forester XT
HKS
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PRODUCT DETAILS
RallySport Direct proudly carries quality performance products from the pioneers of the sport compact industry, HKS. They offer some of the best automotive performance parts on the market for your rally car, race car, or even your daily driver!
Here, you are looking at the HKS SQ4 Sequential BOV. This is the grandfather of blow-off valves with its flagship sound that remains to be one of the most effective blow-off valves in the aftermarket. This blow-off valve has been engineered using durable construction with a fast-acting valve to relieve your turbocharger very quickly of excessive boost. Highly effective for those of you with mild to moderate upgrades.
DETAILS:
- Silver finish
- Pull-type sequential valve structure
- New differential pressure control system allows for stable operating ranges from low to high-boost pressures
- Works quickly to relieve excessive boost
- Works well for those with mild to moderate upgrades
- Comes provided with an OEM-like mounting flange to allow users to have a ready installation
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
RallySport Direct proudly carries quality performance products from the pioneers of the sport compact industry, HKS. They offer some of the best automotive performance parts on the market for your rally car, race car, or even your daily driver!
Here, you are looking at the HKS SQ4 Sequential BOV. This is the grandfather of blow-off valves with its flagship sound that remains to be one of the most effective blow-off valves in the aftermarket. This blow-off valve has been engineered using durable construction with a fast-acting valve to relieve your turbocharger very quickly of excessive boost. Highly effective for those of you with mild to moderate upgrades.
DETAILS:
- Silver finish
- Pull-type sequential valve structure
- New differential pressure control system allows for stable operating ranges from low to high-boost pressures
- Works quickly to relieve excessive boost
- Works well for those with mild to moderate upgrades
- Comes provided with an OEM-like mounting flange to allow users to have a ready installation
