Hear for yourself how GFB blow off valves sound!

Fully Recirculated

Standard Trumpet Atmosphere Drive-by

Standard Trumpet Drive-by

Standard Trumpet In-car

Fully Recirculated

Standard Trumpet Atmosphere Drive-by

Standard Trumpet Drive-by

Standard Trumpet In-car

Recirculated

Standard Trumpet Atmosphere Drive-by

Standard Trumpet Drive-by

Standard Trumpet In-car