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Originally Posted by Truckosaurus
Would the larger restrictors not mean the extra power is released without having to rev higher?
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Yes and NO. The engine is designed then tuned for the restrictor size.
Smaller restrictors ( Larger hole) will allow more air to pass though in to the Throttle bodies. Large Restrictors ( Smaller hole) will limit the air flow, however the speed of the air flow velocity into the throttle bodies is greatly increased.
So the options are:
move volume of air at slow velocity = pushing the HP UP THE RMP range
or
less air at high velocity = pushing the torque levels up in the lower rpm range.
Little over simplifed but that is the idea.