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I read on an evo forum that piston type valves "flutter" until the pressure in the pipes is equalized with the atmosphere. I think that is what you are hearing. I have RFL's plumbed back in as recircs, and the are still RFL, and that "svisha svisha svisha" noise is very obvious at between .35 bar and .6 bar. But when I hit like 1.1, or 1.2, it just barks really loud, no svishy flutter sound.
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