1320 Performance XL Bellmouth Velocity Stack 4" Inlet 10" Bellmouth. - BLACK 

This is the true Drag racing Velocity Stack not the baby 5-6 inch stack that every one else is selling 

(this listing is for the black version Install picture is our silver version, the silver version in our eBay store if you like silver) 

new high efficiency Bellmouth-style Velocity Stacks are ideal for All Motor and Forced Induction race applications.

They allow for less turbulent air to enter your motor, resulting in dramatical airflow improvements and ultimately significant horsepower and torque improvements.
Also helps reduce turbo lag.

Dimensions:

- 4 inch Inlet O.D. 

- 10 inch Bellmouth O.D.