Vibrant??s new high efficiency Bellmouth-Style Velocity Stacks are ideal for All Motor and Forced Induction race applications. Weld them to your turbo inlet or use them in a custom intake system. They allow for less turbulent air to enter your race engine, resulting in dramatic airflow improvements and ultimately significant torque and horsepower gains. Also reduces turbo lag on turbocharged engines. Spun from 1/8?? thick T6061 Aluminum Alloy. * Vibrant Air Filter Part #10960 will fit over the 6" Bellmouth Outlet on this velocity stack.