modding stock valves to high flow valves DOES work, but in my experience, the gains were not too significant (compared to aftermarket), and they were not as consistent as KM high flow valves. It works as a cheap (free) upgrade, though.
I would not recommend modding the floating valve in the same way, as it is a high stress part, and being plastic, I would imagine it snapping quite easily. I've even seen metal ones snap.
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