HKS Super SQV4 Universal Blow Off Valve 71008-AK001

OVERVIEW

The Super SQV4 is HKS's universal pull-type sequential blow-off valve — the design HKS introduced in 1994 and has continued to refine, most recently to close off the counterfeit copies that have followed it. The pull-type relief system and differential pressure control give stable operation across a wide range of boost pressures, and the mounting flange is unchanged from earlier SSQV generations, so it stays compatible with every existing HKS SSQV insert, recirculation fitting and recirculation kit.

71008-AK001 is the standard silver-finish universal assembly — valve only, with no flange or piping supplied. HKS also offers the same valve in a black-anodized finish (71008-AK005). Because it is a universal part, it needs an SQV flange welded or clamped to your own charge pipe — it is not a direct bolt-on for any specific chassis.

SPECS

• Pull-type sequential blow-off valve with differential pressure control
• Nickel-plated die-cast metal secondary valve, swaged to the primary valve
• Stainless steel C-clip and spring for sealing and durability
• Mounting flange unchanged from previous-generation HKS SSQV valves — compatible with existing SSQV inserts, recirculation fittings and recirculation kits
• Weight: 2 lbs. Shipping dimensions: 14 × 7 × 6 in

PARTS INCLUDED

• One Super SQV4 valve assembly (silver finish)
• No mounting flange, welding bung or piping is included — this is a universal valve-only part

TECH RESOURCES

Additional Parts Required

• An HKS SQV mounting flange welded or clamped to your charge pipe (sold separately).
• Piping to route the vent — atmospheric or recirculated — to suit your build (sold separately).
• BMW N54 owners: an HKS-flange charge pipe kit makes this valve a bolt-on — Evolution Racewerks Charge Pipe Kit (HKS BOV) – 135i / 335i 2006-2008 Short, 135i / 335i / 1M 2009-2010 Long, 535i E60, Z4 sDrive35i / 35is E89.
• Toyota GR Supra 3.0 owners: the chassis-specific HKS Super SQV4 Kit 71008-AT021 with the flanged charge pipe is the bolt-on option.

Installation

• 71008-AK001 installation manual (HKS): 71008-AK001 install PDF
• Job summary: have an SQV flange welded or clamped into your charge pipe at a suitable location, mount the valve to the flange, then plumb the reference/vent line per the manual — to atmosphere, or into a recirculation kit if you want it quieter and emissions-friendlier.

Notes

• This is a universal valve-only part — it has no chassis-specific fitment on its own. Fitment depends entirely on the flange and charge pipe it is mounted to; confirm compatibility with the flange/adapter you select before ordering.
• Off-road / competition use — no CARB EO is published for this part.
• Price is for the item selected only; labor is not included.

PART NUMBER

• 71008-AK001 — Super SQV4 universal blow-off valve, silver finish

VEHICLE APPLICATIONS