If you have a blow off valve fitted to your vehicle's turbo charged engine and you notice the blow off noise is not loud enough, then below are the solutions on how to make it sound more louder:
1)The first thing you should do to make a blow off valve sound louder is to increase the amount of boost pressure the turbo charger produces. The more boost pressure the turbo charger produces, the more boost pressure is delivered to the blow off valve, therefore making a louder psshhh noise. To increase the boost pressure on your vehicle, you can get a ecu remap.
2)Connect a microphone next to the blow off valve, and connect the microphone to a car amplifier and place a loudspeaker inside the vehicle's engine. This is a excellent way to make your blow off valve sound more louder and it allows you to control how loud you want it to sound.
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