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If I had to guess that rubber diaphragm was most likely designed to expand and retain a certain amount of pressure inside of the system, once the threshold was exceeded (probably pushing that spring past a mechanical limit) it would vent air back into the intake (releasing pressure and...

Good to hear, looking forward to your results.

How's progress? And any comment on all this stuff I'm reading about a full VTA BOV being bad to swap for one that recirculates?