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Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
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For more information, visit www.P65Warnings.ca.gov.
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.
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.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
