Loading... Please wait...

Blow Off

Super SQV Logo HKS Super SQV (Sequential Blow Off Valve) uses a unique sequential valve structure and a differential pressure control system, which allows for a broad operating range from low boost to high boost. Its Pull-Type relief design ensures stable operation regardless of the amount of boost pressure. The Super SQV will support new generations of turbocharged vehicles.



  1. High Quality Aluminum Die-Cast Body

    Silver-coated aluminum die-cast body. Combines the ultimate in looks and durability in the engine compartment.
  2. High Stiffness Metal Die-Cast Valve

    Secondary valve main portion is made of die cast metal. Reliable operation with beautiful looking.
  3. Triple Fin design produces "Super Sound"

    Triple Fins set at the center of the funnel produces a dynamic and aggressive sound. An optional special Round Fin can be purchased separately for sound tuning.
SQV IV Diagram

  1. Pull-Type Relief Valve Operation

    The Pull-Type valve operation offers more precise relief of excess boost and is compatible for a wider range of boost pressure compared to typical push-type blow off valves.
  2. Primary Valve (Small)

    Lift off the throttle, and the primary valve instantly opens, quickly discharging initial excess boost pressure.
  3. Secondary Valve (Large)

    This valve combined with the Primary Valve from the sequential dual valve structure. Optimal blow-off operation from how to high boost ranges without leaking.
SQV IV Cutaway View

Dual Valve Structure, Sequential System

At low boost ranges the Primary Valve opens, and at high boost ranges the Secondary Valve also opens, resulting in linear response and optimal blow-off operation at all boost levels.

Pull-Type blow off valves will work for any turbocharged vehicle, from stock to highly tuned.

Typical push-type blow off valves require spring load settings for each vehicle specification. If the spring load setting is too low, the valve may leak under high boost and the desired boost setting may not be reach. If the spring load setting is too strong, it may not open at low boost. The Super SQV will operate under any boost pressure setting without leaking.

SQV Comparison

Super SQV Special Fin available in purple or gold

The SQV experience can be further enhanced with the SUPER SQV SPECIAL FIN

  • 1422-SA001 (Color: Purple metalic) has two stage sequential sound that sound level of high frequency is low.
  • 1422-SA002 (Color: Gold) has the same shape and sound as the standard fin. It sounds high frequency from low boost to high boost.


1) Remove 4 shorter bolts of 8 bolts

Tuning SQV IV

To retune the SSQV sound, remove 4 bolts (per diagram) and remove the cover. Do not remove the remaining 4 bolts.

2) Remove the cover

SQV IV Disassembly

Change the triple-fin insert. After removal of the cover, the triple-fin insert can be removed. Select one of 2 fin types, and install the selected fin.

3) Install the SQV Special Fin to the cover

Installing Fin on SQV IV

To install the Special Fin, simply set the fin to the grooves on the removed cover.

4) SSQV sound tuning is completed

SQV IV Sound Tuning

Reinstall the cover and retighten the 4 bolts. Enjoy the tuned blow-off sound.