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Dump valves are designed to release unused boost pressure when lifting off the throttle of a turbo car. When a turbo car accelerates it produces a positive pressure referred to as boost. When you come off the accelerator the throttle butterfly is closed and this boost has no escape route so backs up through the intercooler causing back pressure on the turbo which tries to stop if from spinning. Fitting a dump valve gives this boost the all important escape route it needs. As a result turbo lag will be reduced resulting in faster pick up between gear changes. For a ?whooshh style? noise go for an atmospheric dump valve. For silent operation go for recirculating.