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[robaustin]

I think that the claim is that the turbulence generated by the spacer causes better mixing of the fuel / air mixture and results in more complete or efficient combustion. This can't work for the Hemi since the throttle body spacer is way upstream of the fuel injection points. The turbulence generated by the spacer would have to be sustained all the way through the intake plenum and the intake runners, not a believable proposition.