im lost on this scupper thing.
i think you misunderstand.
with a waterbox - no water back flow issues.
without a waterbox - water back flow issues.
Scuppers get a bad rap for letting air out when the ski is upside down which let's water in through hood and pole breathers and sinks skis. This usually happens when a ski gets away from someone in the surf and they cannot get to it in time to turn it upright or when you let some weak girl ride the ski who somehow turns it upside down and doesn't have the strength to turn it back over.
I was under the impression that the waterbox for the pfp stopped the water from reaching the engine. Am I mistaken?
i rode my boat all day yesterday and landed 2 plate to plate flips, I'm loving my PF pipe. Zero issues and running the water box and scupper valve lol