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When you let go of the gas at high revs or shift, your turbos are still at high revs but your engine is not. This creates a high amount of boost pressure that shoots back down to your turbos from your engine. This causes the turbos to stop suddenly. You can damage your turbos from the sudden stoppage and they take a while to spool back up again. With a BOV, that excess pressure is bypassed into the atmosphere, activated by pressure. It will have dramatic effects on your turbo and engine life, plus mid-range turbo lag is eliminated.
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