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Best Blow-Off Valve: Your Guide in Making the Right Choice

If you have a car with turbo-charged engine, you will most probably need the best blow-off valve, also known as diverter or pop-off valve, among other names. It is the one that creates a powerful sound, which is easily associated with turbo cars. More than this, it is also responsible for protecting the engine and making sure that the car retains its tip-top performance.

In the rest of this guide, we will help you find a blow-off valve that will be perfect for your needs. We will identify some of the most important factors to consider, as well as five of the best products that can provide the best value for money.

What is a Blow Off Valve?

To begin with, let me tell you one thing – a blow-off valve is not necessary for all cars. It will be a waste of money if you buy one and in the end, you realize that this is not actually required by your vehicle. A blow off valve is an essential for turbocharged and supercharged cars. The following are some of the reasons why you need to have blow-off valves:

  • Create a Loud Sound: This might seem like pretentious or annoying, but when you have a turbo-charged engine, you will need a blow-off valve. The whoosh noise that is created by this device will make it easy for your car to be noticed on the road, making many envious of what you are driving.
  • Prolong the Life of your Turbocharger: Another good thing about using the best blow-off valve is that it aids in the prevention of surge loading, which can be instrumental in extending the lifespan of both the engine and the turbocharger.
  • Improve Performance: Your turbo car will surely demonstrate optimal performance with a best blow-off valve. It is effective in the maintenance of turbine speeds in between shifts. In turn, this enhances speed and overall performance of your car.
  • Prevent Expensive Repairs: Prevention is better than cure. This holds true even in the case of your car. A blow-off valve is one of the things that will help in the prevention of suffering from costly repairs in the future.

Types of Blow-Off Valves

It is important to decide on the specific type of the blow-off valve that is perfect for your needs. In this case, the following are two of the options that are available in the market:

  • Vented Blow-off Valve: In the case of this blow-off valve, the air will be released in the atmosphere. One of its greatest advantages over its counterpart is that its installation is easier.
  • Recirculated Blow-off Valve: With this blow-off valve, on the other hand, there will be recirculation of air back to the system. If you have a Mass Air Flow sensor, this is the perfect choice for you.

Top Picks for the Best Blow-Off Valve

If you have no idea on what to purchase, below are five products that you should include in your list of choices.

1. Turbosmart TS-0203-1061 Blow-Off Valve

Are you looking for a blow-off valve? This is one option you might want to consider. You can be confident that quality and functionality are pretty good.

The size of this valve is 7x6x5 inches. With this, you can expect its sleek body, which makes it easy to install, and more importantly, space-efficient. However, you should first see if this is fitted for your car as it does not offer universal compatibility.

It is also a good thing that it is lightweight. At only 7 ounces, you might think that this is an inferior product. In reality, however, it can deliver monstrous performance. It is surprising that at such a sleek body, it can deliver power that is hard to rival.

The sequential timing that is offered by this product is another reason why it is impressive. This means that when you are driving in a normal situation, the engine will be quiet. The whoosh sound will only be evident when you are racing at top speed.

In terms of durability, this can also be an exceptional pick. Unlike some counterparts with plastic components, it does not contain unreinforced diaphragms. The latter can be easily prone to cracks.


  • Crispness of sound
  • Solid built


  • No universal compatibility
  • May lack boost consistency

2. Go Fast Bits T9351 dv+ Blow off Valve

Money well spent – this is one thing that you can expect from this product. This can deliver excellent quality without breaking the bank. To avoid frustration, however, make sure first that it is compatible to the requirements of your car.

The simplicity of this product is one more thing that should be emphasized. Installation can be accomplished easily. The factory solenoid coil is retained, which will allow seamless integration. It also has direct-fit placement that simplifies its assembly.

In the case of other alternatives, you will be required to replace the entire system, which is not only costly, but can also be complicated. Because of these complications, they tend to be slower and deliver lesser response, unlike in the case of this blow-off valve.

The Pilot-Actuated system is one technology that is worth noting. It has been exclusively developed by the manufacturer, providing the product with a distinct advantage above its competitors. The latter is the one that is responsible for delivering quick response even at high boost.


  • Holds turbo boost excellently
  • No surge issues


  • No universal fit
  • O-Ring is flimsy

3. GFB 08-10+ WRX / 05-09 LGT TMS Respons Blow Off Valve Kit

You will be easily convinced that this is indeed an excellent choice. It is an investment that you should have for your car, especially because it can good performance.

One of the reasons why you might like this kit is because it already comes as a kit, complete with everything that you will need for its installation. Aside from the valve, a gasket and wrench are also included in the kit.

It is also user-friendly. It has dimensions of 7x7x4 inches, making it space-efficient. The manufacturer provides comprehensive instructions on how you can complete the installation in a snap.

Another good thing about this product is its versatility, which is because of the fact that it offers customization options. You can fine tune the valve based on what is required by a specific vehicle.

It is also worth noting that it comes with a durable construction, providing you with the assurance that it will last for a long time. Even through the years, you can be confident that it will deliver optimal performance.


  • Easy to install
  • Fully-adjustable
  • High-quality construction


  • Can Cause backfiring

4. HKS (71008-AK001) Super SQV4 Sequential Blow Off Valve Kit

The clean and crisp sound produced by this blow-off valve is one of its greatest features. With the latter, you will surely turn heads on the road. More than the sound of your engine, it is also effective in optimizing performance in more ways than one.

This product might be one that you will love because of how it is already inclusive of everything that you will need to proceed with the installation. Aside from the valve, it already includes O-ring, vacuum filter, C-clips, zip ties, and T-fittings. The manufacturer also provides detailed instructions.

Another thing that makes this an exceptional choice is the pull-type relief structure. The latter is the one that ensures the stability of the valve regardless of the boost. This will make sure of its consistent performance.

Lastly, it is important to remember that there are plenty of knock-offs in the market. Its popularity makes it often imitated. With this, you should take time to look at the product and make sure that you are buying one that is authentic.


  • Easy to install
  • Complete with everything you need
  • Durable construction


  • Can cause leaking

5. GReddy (11501665) Blow-Off Valve

Although not as popular as the four products that have been mentioned above, this is another option that is worth considering. One thing that we loved about this product is its universal compatibility. It can deliver decent performance in all vehicles.

It has dimensions of 9x5x7 inches, which is pretty much compact. This is a good thing as it removes the difficulty in its installation. This also means that you can have it placed without the need to remove other components of the engine.

This blow-off valve can deliver guaranteed performance in all conditions. Regardless of the external conditions, it can be impressive. The air flow and response will be excellent all the time, which is why it is ranked well when it comes to dependability.

Lastly, it has a floating valve design, which gives it a distinct advantage above many others. There is a dual spring system, which can be customized based on what the situation requires. This is also one of the reasons for its durability.


  • Durable construction
  • Produces loud sound
  • Easy to install


  • Kit does not include flange
  • Not as popular as others

Essential Factors to Consider

As you try to narrow down the possibilities and make the right decision, here are some of the things that should be taken into account:

  • Reviews: The first thing that you have to do is to seek for the opinions of other people. A lot of them are generous enough to go online and write about their experiences. You can learn a lot from what they are saying, which will also make it easy to weigh the good and the bad for each option.
  • Compatibility: Blow-off valves do not offer universal compatibility. With this, avoid wasting your money by doing your research to know which one is compatible for your vehicle.
  • Size: 40mm is perhaps the most popular diameter for a blow-off valve. However, there are some cars that may require a different size. With this, you should know how much space is available for installation to choose a valve that is compatible for your car.
  • Noise Rating: Earlier, we have noted that a blow-off vale will add whoosh to your car, making it produce a noise that will turn heads. The level of noise that it produces, however, will differ from one product to another.
  • Installation: Ideally, you should find one that is user-friendly, which means that its installation can be accomplished in a snap. You do not need the help of the pros to accomplish this task. It is important that there are detailed instructions to guide you through the process.
  • Maintenance: Through the years, your blow-off valve will be prone to wear and tear. Leaking is one problem that is common, which will significantly weaken its performance. With this, you should choose one that is easy to maintain, which can be tantamount to extended lifespan.
  • Price: Yes, it is tempting to choose a blow-off valve that comes with a cheap price. However, this is one thing that you can possibly regret in the future. It should be seen as an essential investment. Even if the valve is expensive, if the performance is unmatched, it will be a good product to purchase.


Now that you are done reading, I hope that you already know how to choose the best blow-off valve. It can be a lot more complicated than what you think, especially because of the abundance of the options that are available in the market. To make things easier, keep an eye on the five brands and models mentioned above.

A blow-off valve is just one of the essentials for your car. To know more about the other things that you might need, click here.