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BoVs do not rely on the spring pressure to hold them shut against boost, they have boost pressure applied to the rear of the diaphram via the actuation pipe. The spring is only there to define the opening point in relation to manifold vacuum and to hold them shut during spool when there is a delay between pressure on either side of diaphram......
 

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Indeed - you will not achieve 160 000km durability without a dump valve. Does this concern the average GTR owner / tuner, probably not. It does not change the reason for the component being used!
 
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