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HPI 40MM Open Style Race BOV Blow Off Valve
Compact size. Big boost control. The HPI 40MM open style race blow off valve is built from precision 6061 billet aluminum for boosted builds that need fast pressure release, clean fitment, and race-ready durability.
Buy NowBuilt For Tight Engine Bays & Serious Boost
The HPI 40MM open style race BOV is the smaller blow off valve option for builders who need performance without fighting space. It is designed for tight, compact engine compartments while still flowing the air needed when boost pressure needs to escape fast.
This HPI blow off valve is made from precision 6061 billet aluminum and finished in black anodizing for added durability. It uses the same style flange kit as the ProCharger Big Red race valve, with similar race-valve specs in a smaller package built for tight engine bays. The product listing rates it for 300 to 1200 horsepower. :contentReference[oaicite:0]{index=0}
40MM Compact Race Design
Smaller than the 60MM Big Red style valve, making it ideal for tight boosted engine bays where space is limited.
6061 Billet Aluminum
Precision-machined billet aluminum construction gives this BOV strength, durability, and a clean performance finish.
300–1200 HP Rated
Built for serious boosted applications and rated for performance builds from 300 to 1200 horsepower.
Key Product Features
- HPI 40MM open style race blow off valve
- Designed for turbocharged and supercharged performance applications
- Precision 6061 billet aluminum construction
- Black anodized finish for increased durability
- Compact size for tight engine compartments
- Uses same style flange kit as ProCharger Big Red race valve
- Smaller alternative to the 60MM Big Red style valve
- Rated for 300 to 1200 horsepower
Why Your Boosted Build Needs The Right BOV
A blow off valve is not just a noise maker. On a boosted setup, it helps release excess pressure when the throttle closes, helping reduce compressor surge and keeping your turbo or supercharger system happier under aggressive driving.
If your build is tight on space but still serious about boost, this 40MM HPI race BOV gives you a compact, durable, high-flow solution that looks clean and works hard.
Control The Boost. Protect The Build.
Upgrade your boosted setup with the HPI 40MM open style race BOV and get compact race-valve performance without the oversized fitment headache.
Buy NowFrequently Asked Questions
Is this the 40MM or 60MM BOV?
This is the smaller 40MM HPI open style race BOV, not the 60MM Big Red style valve.
What material is this BOV made from?
It is made from precision 6061 billet aluminum.
What horsepower range is it rated for?
The HPI product listing rates this BOV for 300 to 1200 horsepower.
Is this good for tight engine bays?
Yes. This smaller 40MM design is built specifically for compact engine compartments where larger blow off valves may be harder to fit.
Shipping & Delivery Information
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⚠️ WARNING (California Proposition 65):This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.For more information, please visit www.P65Warnings.ca.gov.
