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One thing I don't understand about the system is that if the valve profile changes (because of the movable collar), how does the valve seat? Does the collar collapse back as the valve seats? I can't imagine the movable collar would last long if that were the case. It would also mean that the collar has to move only when the valve leaves the seat, which doesn't give it much time to open and close, and, consequently, to do much good.
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Steve Wilwerding
1998 3.4L Zenith Blue Boxster
2009 Meteor Gray Cayenne
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