A Trick Flow® High-Flow Upper Plenum can add as much as 100 cfm of additional air over stock. In fact, these plenums increase airflow by 20% with a stock throttle body and 30% with an aftermarket 70mm or 75mm throttle body. Made for 1996-2004 4.6L 2V engines, the aluminum plenums are raised .750 in. to enhance airflow yet still fit under a stock hood. They work with stock sensors, are compatible with throttle bodies up to 75mm.
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