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Wait a minute... They don't give any performance gain.... but they give more bottom end? Say what? Last I checked more bottom end counts as a performance gain.
It should read "They don't give any performance game" period.
And they would do absolutley, possitively, utterly,nothing on a 3.9. The 3.9 has a much worse intake manifold setup than the 4.7l If anything if there were any gains to be seen it would happen on the 4.7l.
they do absolutely nothing on the 3.9 5.2 5.9 because of the beer keg type intake manifold. i have heard though that they have shown a slight gain on a 4.7.
I need someone to explain to me how adding a throttle body spacer ona motor using multi-port fuel injection will see any gains...Please keep in mind that the "butt-dyno 1000" results cannot be submitted as an explination.