HKS Super SQV4 Blow Off Valve (Universal BOV) Silver 71008-AK001 or Black 71008-AK005

If you want the classic sharp HKS blow-off sound, this is the universal Super SQV4 valve. Its sequential two-stage design releases excess boost when you lift off the throttle, with the small primary valve responding first and the larger secondary valve opening as pressure increases.

Unlike a vehicle-specific HKS blow off valve kit, this universal version is not a bolt-on part by itself. It needs a compatible HKS flange or vehicle-specific adapter and the correct vacuum hose setup for your car. It can also be used as a replacement valve when your charge piping already has a compatible HKS SQV flange.

Fitment Information

• Universal fitment for compatible turbocharged applications
• Can be installed on custom intercooler or charge piping using the correct HKS flange
• Can replace an existing valve mounted to a compatible HKS Super SQV flange
• This is not a vehicle-specific bolt-on kit

Important Installation Information

• A compatible HKS flange or vehicle-specific blow off valve adapter is required.
• New installations may require welding or modification of the intercooler piping.
• The necessary 4mm or 6mm vacuum hose is not included.
• The valve needs to receive its pressure and vacuum signal from the intake manifold.
• Whether the valve should vent to atmosphere or recirculate depends on the vehicle's airflow metering system and tune.
• Optional HKS 19mm and 29mm return fittings are available separately for recirculated installations.
• Professional installation is recommended for custom applications.

Finish Options

• Classic Silver: Silver-coated die-cast aluminum body with polished funnel – HKS 71008-AK001
• Black Edition: Gloss black body with textured crystal black funnel – HKS 71008-AK005
• Both finishes use the same Super SQV4 valve design and operate the same way.

Specs & Features

• Universal HKS Super SQV4 blow off valve
• Sequential dual-valve design
• Small primary valve responds to the initial pressure change when the throttle closes
• Larger secondary valve opens as the pressure difference increases
• Pull-type valve design works across a wide range of boost pressure without conventional spring adjustment
• Differential pressure control helps keep the valve closed while the engine is under boost
• Triple-fin outlet produces the classic sharp HKS BOV sound
• Die-cast aluminum body
• Metal die-cast secondary valve
• Optional HKS round sound insert available separately

What's Included

• HKS Super SQV4 blow off valve
• O-ring
• C-ring
• 6mm x 4mm x 6mm T-fitting
• 4mm x 4mm x 4mm T-fitting
• Vacuum line filter
• Tie wraps
• Installation instructions

Part Numbers & UPCs

• Silver: 71008-AK001
• Silver UPC: 4957266265017
• Black Edition: 71008-AK005
• Black Edition UPC: 4957266265697

Emissions Compliance

This HKS blow off valve does not have a CARB Executive Order number and is not legal for sale or street use in California or other states that follow California emissions regulations.

Pairs Well With

• HKS Air Intake Kits – Pair the Super SQV4 with a vehicle-specific HKS intake if you want more turbo and intake sound while improving airflow into the engine.
• HKS Exhaust Systems – Complete the HKS setup with an exhaust designed for better flow and a more noticeable exhaust note under boost.

Watch the HKS Super SQV4 Sound Clip

Here is a sound clip from HKS showing the Super SQV4 on a GR Yaris. The exact sound will vary depending on the turbo, boost pressure, charge piping and where the valve is mounted.

About HKS

HKS has been building Japanese performance parts since 1973 and is known for its turbo systems, exhausts, intakes, electronics and engine components. The Super SQV series has been one of its most recognizable products for years, especially for anyone looking for that sharp HKS blow-off valve sound.