they dont pop at a point. They open when there is a difference between the 2 ports. On a gasser they lead to opposite sides of the throttle plate. On a diesel, you need to trigger a air solenoid to dump pressure off of one side to open it.
you would trigger it to open when you are at idle, so when you let off to shift it opens.
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Call Me At 248 459 9263- I Will Trade You A 6.5 Turbo For It. I Met You At Milan Dragway Last Fall, I Have The Blue Lifted Duramax. I LIVE IN FARM. HILLS, MI