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Holley STS Turbo Blow Off Valve STS56

Holley STS Turbo Blow Off Valve STS56
Holley STS Turbo Blow Off Valve STS56Holley STS Turbo Blow Off Valve STS56Holley STS Turbo Blow Off Valve STS56Holley STS Turbo Blow Off Valve STS56Holley STS Turbo Blow Off Valve STS56
$535.99 ea
NEWARRIVING SOONEstimated Ship Date 04/10/2023 (If Ordered Today)32 available from HOLLEY PERFORMANCE PRODUCTS as of 03/07/2022
Model: 3993009
Supplier has not provided any fitment data for this product.
[More Info]
STS Turbo blow off valves are a great choice for your turbo system. We utilize Turbosmart components to offer the highest quality blow off valve possible. It features unique collar design and internal flow structures, making it 50% lighter and 25% smaller than most other blow off valves all while flowing over 330 CFM. Our BOV construction includes a MILSPEC hard anodized valve guide and stem with positive sealing valve seat and a proven silicon nomex diaphragm for maximum reliability. The black anodized top and red internals gives it a unique appearance along with having a quick release V-band collar for ease of installation or removal and two vacuum ports for convenient line positioning.
  • Heat Resistant Up To 450 Deg
  • Woven Mesh Design
  • Designed To Run Dry
  • Slides Directly Over Air Filter
Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle

About Holley Performance Products

Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy NASCAR Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution or partnered with products from other Holley companies we can give you the edge you need over the competition!


Adjustable Yes
Aluminum Flange Included No
Attachment Style V-band
BOV Top Cap Finish Black Anodized
BOV Top Cap Material Aluminum
Emission Code 3
Fitting Size 1/16 NPT
Fittings Included Yes
Hardware Included Yes
Inlet Size (inch) 2 inch
Inlet Size (mm) 52mm
Instructions Included Yes
Number of Fittings 2
Part Type Turbocharger Blow Off Valve
Style of Adjustment Spring


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Holley STS Turbo Blow Off Valve STS56:
Classic Nova 2023