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exactly... seriously sorted cars need them to help protect the turbo... cars under 450bhp(and a few other factors) really don't need them.
is that a quote from the "I don't know what the **** im talking about tuners guide"?
you may be new so ill be the one to point out the impreza has a dump valve from the factory, it just dumps back into the intake and is called a recirc valve.
Last edited by tubbytommy; Jun 21, 2013 at 02:53 PM.
A lot o the bigger power cars run DV less and most of the noise is compressor surge usually and not the DV.
In my 8ish years of Scooby ownership I have had Forge, Perrin, APS, HKS and a bailey dv12.....for the last 4 years I have run the OEM one, Nothing comes close for drive ability and throttle response IMO
