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The factory airbox and plenum is actually very good! When I'm cruising about 50 mph and there is some water droplets in the hood vent, the air passing through the airbox, the water is actually flung Up and out. I'm sure it's different when WOT but I doubt there is any restriction. I'm no expert just giving my opinion.
The only bottleneck, IMO, would be between the airbox and intake manifold if any.
The only thing I don't like about the OEM setup is the filter is held in by a spring instead of being hose clamped.
Save your money and and get a drop in. put the savings to other mods..
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