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here is the ranking (the way i see it)......#1 turbo valve, 2. evil valve, 3. stock valve
the evil valve only has one advantage over the stock valve, and that would be the valve pin. its shaped a certain way to allow slightly more air flow. the turbo valve on the other hand, has a greater capacity for flow, but still has the stock pin. so, the best way to go (imo), is to get a turbo valve and an evil valve pin (which also needs a special spring, but it should come with it, im not sure tho).
i do have an evil valve for sale, if you are interested
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