That actually helps tremendously. I hadn't considered that they were just using breather holes already built in to specific models design.ThanksOk now my harder question you could probably answer with your experience, lets say the valve is modified to work perfectly efficent at any pressure would i see any difference between a 15cc plenum @2500 psi vs 24cc @1500psi (same amount of air)? Id assume the 2500 would shoot faster