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The carbed turbos have what is termed a "pop off valve". When the plenum recieves a pressure spike, like in a gear shift, it releases the excess pressure. Where as a BOV releases pressure reguardless of the pressure level. The TE is set to pop off at 15psi. The spike is addressed by the ecu in the fuel injected cars. I beleive a BOV is a good idea on turbo cars to ease the strain on the vanes. I do also believe, because of the sound of the BOV, the boy racer types make it a little cheesy to have one. However the recirculating type make little to no noise.



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