blow off
is not just about sound
when and if you modify the turbo or replace it with one that really blows
you are talking about several times more pounds of forced air than stock
being shoved into the engine . when you let off the gas that forced air lets say 18lbs is looking for some place to go . without a proper blow off vavle that air goes right back to the turbo and can cause backspin , not good for a turbo that is designed to go in one direction all the time .
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