Vibrant Bellmouth Velocity Stack

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Vibrant Performance Bellmouth-style Velocity Stacks allow for less turbulent air to enter your intake, resulting in air flow improvements and, ultimately, torque and horsepower gai ns. They are spun from 1/8" (3mm) thick 6061 Aluminum Alloy and available in 4" or 5" ID. 4" Velocity Stack has a 7.000" Bellmouth OD 5" Velocity Stack has a 8.750" Bellmouth OD Show more