Trick Flow Upper Plenum for 1996-2004 4.6L 2V Mustangs.Better airflow equals more power. More horsepower starts with more air, as much as 100 CFM of additional air over stock with a Trick Flow High-Flow upper plenum. Made for 1996-2004 4.6L 2V powered Ford cars and trucks, the aluminum plenums have been raised 3/4 in. to enhance airflow yet still fit under a stock hood. They work with stock sensors, are compatible with throttle bodies up to 75mm, and come in silver, black, and natural finishes.