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We’ve all heard the distinctive sound of a blow-off valve, but what exactly does it do, how does it work, and how do you know which type to buy for your car?

In this video we explore the basic principles of the induction system on a turbocharged or supercharged vehicle, how a Blow-Off-Valve works, and the pros and cons of fitting on to your car.

The different types of valve including Bypass, Dual Port and Atmospheric are also discussed.

The principles discussed in this video apply to all turbocharged and many supercharged cars.






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