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Just information seeking about 2-step

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Hi guys!

I found a video about an old vw which has a really interesting 2-step which I never saw anything like that. Could somebody explain why is it working like this, it is like a jet engine not like a conventional popping limiter.

[url=https://youtube.com/shorts/ynuB1rEdRQU?si=iK5plTIn5EWbb4Oe]https://youtube.com/shorts/ynuB1rEdRQU?si=iK5plTIn5EWbb4Oe

Many thanks!

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