The idea is that you place the broom stick across the roll jump and the windscreen. If the helmet touches the stick, you fail.
PCA allows the boxster regardless of broomstick-test pass or failure. And my local track events seem to all defer to PCA on that. I've never been tested or questioned.
Many organizations have developed a short list of cars that are acceptable with the factory roll humps, without further modification. The boxster has been on every one of those lists that I've seen.
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