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QEV = quick exhaust valve.
it is a replacement for the front banjo fitting of an ion. what it does is release back presure faster than normal, making it possible for the bolt to return faster, yielding better efficiency and increased CPS. there is one drawback, and its not that bad, but it wears out your bolt o rings a lot faster....but whats a few cents for the improvement of effiency and speed?
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