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Aubrey
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Does car run rite with the dump valve on?do you like the sound?if yes to both then leave it on.if no then you could go with an ajustable on to recer and dump to get it to sound and run rite.if you dont want noise then go with oem sti recerc.

 

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A VTA dump valve can make your car run rich as everytime it vents the air to atmosphere to stop back pressure etc. a recirc keeps the air in the system keeping your mixture closer to 1 lambda.

Is this a bad thing  - not necessarily, does it make more noise - yes

choice is yours - or ditch any valve and have some turbo flutter instead - not great for your turbo in the long run but sounds authentically rally

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