Today we are covering everything you need to know about HKS’s line of different Blow Off Valves, and kits, and which one is the right choice for you! We will cover the most frequently asked questions along with some hacks to making your blow-off valve louder. We are going to turn this post into the ultimate buyer’s guide for HKS Blow-Off Valves by explaining in detail why HKS SQV4 Universal Super Sequential Blow-Off Valve is so damn good. For those who don’t know, the HKS Sequential BOV is a well-known and highly regarded blow-off valve (BOV) in the automotive aftermarket industry.

The HKS Blow-Off Valve is manufactured by HKS, a prominent performance parts manufacturer based in Fujinomiya, Japan. The company introduced the SSQV BOV in the early 1990s, and it quickly gained popularity among car enthusiasts around the world. HKS is respected in the aftermarket industry, as the company focuses on designing products that solve problems found in stock parts. This statement is especially true when it comes to the design of HKS BOV SSQV, which was designed to address the limitations of stock blow-off valves, which release excess pressure from the turbocharger system when the throttle is closed. Due to their poor construction from inexpensive materials which are not optimized for performance and limiting design qualities, stock BOVs often suffer from issues such as leaking, slow response times, and inadequate flow capacity.

With the manufacturing of HKS BOV, the brand sought to overcome these limitations by developing a blow-off valve that offered improved performance, reliability, and sound. The SSQV was designed with a unique sequential valve structure, which allowed for quick and precise pressure release. It utilized a piston-type design with dual valve springs and diaphragms, providing enhanced response and durability compared to stock blow-off valves.

Shop All HKS Blow Off Valves

One of the critical reasons for the popularity of the HKS SSQV BOV is its distinctive sound. The sequential valve structure, along with the dual valve springs and diaphragms, creates a distinct and recognizable “whoosh” or whistle sound when the pressure is released. This sound has become synonymous with turbocharged performance cars and is often desired by car enthusiasts as a flex of power and performance when done tastefully.

Additionally, the HKS SSQV BOV gained popularity due to its reputation for quality and reliability which are signature characteristics of HKS products. The company has a long-standing history in the automotive aftermarket industry and is known for producing high-quality performance parts. The SSQV BOV was designed and manufactured to meet HKS’s rigorous standards, ensuring long-lasting performance and compatibility with a wide range of turbocharged vehicles. Typically compared to its knock-off versions, the authentic HKS SSQV is constructed and engineered to meet the demands of high-performance vehicles, and their quality and long-lasting characteristics make them worth the bucks. We do not recommend the knock-off version blow-off valve as a replacement.

Overall, the HKS SSQV Blow-Off Valve has achieved popularity and acclaim among car enthusiasts due to its superior performance, distinctive sound, and reputation for quality and reliability. It has become an iconic aftermarket upgrade for turbocharged vehicles, offering improved functionality and an enhanced driving experience, and sound. If you would like to buy the HKS SSQV, you can CLICK HERE to buy the HKS Universal Super Sequential Blow-Off Valve Kit, or you can use the links below to buy HKS vehicle-specific Super Sequential Blow-Off Valve Kits;

• Shop Toyota Kits
• Shop Honda Kits including kits for the 10th Gen Honda Civic
• Shop Nissan Kits
• Shop Mazda Kits
• Shop Mitsubishi Kits which includes kits for the Mitsubishi EVO X
• Shop Subaru Kits including kits for the Subaru WRX

You can also buy the HKS Racing Sequential Blow-Off Valve Kit (which is the racing option) by CLICKING HERE.

Since we promised you answers to your HKS SSQV questions, here are some of the frequently asked questions when it comes to this BOV;

• Can the HKS BOV be adjusted?
  • Answer: No, the HKS SSQV is not an adjustable BOV. Although, for higher power and larger displacement applications, HKS does recommend the Racing SQV. The Racing option (71008-AK004) is a larger 51MM valve that has an adjustable pre-load for a wider range of high-performance applications.
• How to make the HKS BOV louder?
  • Answer: The Blow Off Valve can be made louder by replacing the original Fin. HKS produces 2 optional Fins for the BOV. The Gold Triple Fin (1422-SA002) has a mild blow-off sound that is a bit louder than stock. There is also a Purple Round Fin (1422-SA001) that produces a louder and higher frequency blow-off valve sound. (Pshhhhh)
    We’ve found the Purple Fin seems to be the people’s champ.
• Is the HKS BOV easy to install?
  • Answer: Yes, the installation process for an HKS Blow Off Valve is rather simple. Although, if you decide to go the route of buying a Universal Blow Off Valve kit, it can take some extra fabrication and piping to fit the BOV to your vehicle. This would make the installation more advanced and require more technical knowledge.
• How do you install the HKS SSQV?
  • Answer: Installing the HKS Blow Off Valve is a rather easy process and all the installations manuals can be found here:
    https://www.hksusa.com/manuals#blowoff
• How to tell if an HKS BOV is real?
  • Answer: You always want to purchase HKS parts through a trusted reseller. Vivid Racing is a Master Seller of HKS products and has been a trusted dealer for over 20 years.

You can get the replacement Super Sequential BOV Parts by clicking on the link below:

• C-Clip and O-Ring 
• Vacuum Filter
• Weld On Aluminum Flange 50MM
• Weld On Aluminum Flange 60MM
• Weld On Aluminum Flange 65MM
• Aluminum Flange 35MM 40 Degree
• Recirculation Fitting 29MM ID Hose
• Recirculation Fitting 19MM ID Hose
• Gold Fin
• Purple Fin