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Gotcha about the restriction, but if I understand the theory behind the theory on these gaskets is that the fuel droplets are supposedly split asunder into teeny tinyer driplets :-)
That's why I said that this would probably work better on an engine with a carb...injector spray patterns being so fine to begin with, there's not much more that can be done short of changing the physical state of the fuel from a liquid to a gas.
Right however you are also creating turbulence before the valve. Whether or not this will change your efficiency at higher rpms is unknown to me personally but to add a mass in the intake and then say it helps even though its restrictive doesnt sound right to me. I may be wrong about this as I only know a little about a little but if they were soo good then they would more popular. I have seen these gaskets come and go twice in the afermarket over the last 15 years.