On orders over $100
100% Money Back on Select Parts
Product images
Product Media
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve (Part Number: )
Community Media
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve (Part Number: )
HKS Super SQV4 Blow Off Valve
Read 6 Reviews | 17 Q&As
Part # 71008-AK001
msrp: $295.00

In stock! Ships same day
Universal part

Features & Product Details

RallySport Direct proudly carries quality performance products from the pioneers of the sport compact industry, HKS.

On this page, you are looking at the HKS SQ4 Sequential BOV. This is the grandfather of blow-off valves with its flagship sound that remains to be one of the most effective blow-off valves in the aftermarket.

Here are the details:

  • Pull-type sequential valve structure
  • New differential pressure control system allows for stable operating ranges from low to high-boost pressures
  • Includes vacuum line filter
  • Includes circlip, T-fittings, and zip ties
  • Specifications

    Brand: HKS
    Adjustable: No
    Color: Silver
    Design: Diaphragm
    OEM Replacement: No
    QTY: 1
    Valve Type: Atmospheric
    Includes Gasket(s): No
    Mfgr. Warranty: 1 Year
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days

    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



    6 Reviews
    3.3 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
    HKS Super SQV4 Blow Off Valve ( Part Number: 71008-AK001)
    HKS Super SQV4 Blow Off Valve ( Part Number: 71008-AK001)
    Phenomenal product 1 month ago
    5out of 5stars

    This BOV does exactly what it should o months now and have had no issues at all. After fitting the BOV to a vehicle specific flange and making sure that I had the angle correct for hood clearance, things went very smoothly. This is by far one of the best BOVs on the market. If you want an amazing BOV that is made by a quality manufacturer... LOOK NO FURTHER... this piece of art will turn heads and Make you smile from ear to ear at every release of boost. It is also very nice to have the ability to change the frequency of the release with easily installable fins.... The perfect product for ANY turbo vehicle.
    Was this review helpful?
    1 of 1 people found the following review helpful
    Updated review! 2 years ago
    4out of 5stars

    I have been able to fix the issue that I was having with my 2013 wrx hatch, the bov was fine and works as it should! its a solid piece however the bottom plate still had its issue where it was not even all the way across and it had issues fitting in attachments made for it.
    Was this review helpful?
    1 of 1 people found the following review helpful
    Its alright, while it lasted 2 years ago
    2out of 5stars

    Alright, so I bought the BOV and flange from a highly reputable perfomance shop about 2 or 3 months ago. It was a pain to put on the adapter because the bottom plate of the BOV was too big and not consistent on how thick the metal is. I had to shave it down a bunch on one side of the BOV and a little on another to get it to fit. Let me tell you that thing really fits in there. Now after 2 months of driving around with it, im assuming the seal in the BOV went bad, when I get into boost, I can hear a larg ammount of air coming out of the BOV. Im going to see if I can fix it or just replace it with a different one.
    Was this review helpful?
    Awesome product  2 years ago
    4out of 5stars

    Overall the product is well made and the sound it makes is intoxicating. I have 2 friends that have this on their cars and it sounds ridiculously good. You'll be popping on and off the throttle continuously. The only issue I had was that I could not get it to fit with my PW Verticooler there just wasn't enough clearance. I'm sure there is a way to get it to fit somehow but not that I could see. Yes you have to buy the separate flange but that's why it's a universal part not a vehicle specific.
    Was this review helpful?
    Before you buy 2 years ago
    2out of 5stars

    I own a 2011 WRX, so if you have the same car or an 08+ read this before you decide on purchasing the part. This is not a bad review, but a heads-up that you will have to buy a few accessories. A flange, which has a part number mentioned in the review. And, a plug for the recirculating hose. It does have to be welded because our type of car. But, once I get this baby inside I will let y'all know my satisfactory with the item.
    Was this review helpful?


    • Q: 07 Mazda speed3   Tony gonzalez5 months ago

      Will I have to buy the flange separately to install this on my vehicle? And do you guys sell the flange for it if it doesn’t come with it?
      • 0 of 0 people found the following answer helpful

        A:  This would require an adapter to fit on your MS3. It would be an item that we don't normally list, but call our customer service department and we can special order it for you.

        Marcus E. @ RallySport Direct 2 months ago  
        Was this answer helpful?
    • Q: Fitment   Brandon276 months ago

      What other parts would I need to have this fit on a 2007 Subaru Impreza WRX STI
      • 0 of 0 people found the following answer helpful

        A:  For this part to fit on an 07 STI you would just need Part # ATP-FLS-079 HKS does offer an SQV4 BOV in a kit that is specifically for 04-07 WRX/STIs Part # 71008-AF006.

        Karsten B. @ RallySport Direct 6 months ago  
        Was this answer helpful?

    This Part Fits

    Universal Product
    This item is non application specific.
    Please verify compatibility before purchase. May require some modification for proper installation.