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a dump valve can't be fitted to non-turbo cars because it's function is intrinsic to the correct function of a turbo.

It's used to dump air out of the path of the turbo when you come off the accelerator:

1)It stops the turbo compressor stalling and thus saves the compressor blades from being exposed to the harmful stresses that occur from the shock wave generated from the suddenly closed throttle plate.

2) It reduces turbo lag, because the vanes of the compressor are allowed to spin freely after the throttle has been shut off.. instead of being stopped instantly by the change in air pressure.

Think of the dump valve as a diverter valve...and as part of the turbo's plumbing.. no turbo.. no plumbing
 

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Its basic function is to dump excess pressure above atmospheric pressure away from the inlet manifold. In a normally-aspirated car, the air is never above atmospheric pressure. If he wanted the hissing sound (which I much prefer to do without), he wouldn't get it.
 
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