Velocity Stack:
Trumpet-shaped device fitted to the air entry of an engine's intake system
a) Velocity stacks allow smooth and even entry of air at high velocities into the intake tract,
with the flow stream adhering to the pipe walls.
b) Velocity stacks modify the dynamic tuning range of the intake tract by functioning as a resonating pipe, which can adjust the frequency of pressure pulses, based on its length, within the tract.
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