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The technique is interesting raising and lowering a complete stack over a smaller one vs sliding. Can get a bigger change. One that they show is a massive change - looks like adding a 3" stack on top of a 1" one.
Would've been good for them to show a dyno across rpm range with stack up and stack down. Then can figure out where to lift. Similar to what you do with an intake with resonance flap.
Mechanically, just about anything can be adapted. One challenge I see for 911 motor is filtration. Their's is inside airbox so no issue.
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