Vibrant Bellmouth Velocity Stack Aluminum (4in Neck O.D. 7in Bellmouth O.D.)

Bellmouth Velocity Stack, 4" Inlet O.D. x 7" Bellmouth O.D.

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 gains. They are spun from 1/8" (3mm) thick 6061 Aluminum Alloy.