We call this the Blox "BLACK HOLE" Velocity Stack. The Blox velocity stack features a 3 inch diameter neck, so it can be used with a variety of intake systems. It's one-piece aluminum construction and black anodized finish, give this a very aggressive looking, yet stealth-like appearance. The Blox velocity stack is also designed with a flow-contoured entry that will help assist in improving air induction and efficiency by making a smooth entry for air and adding velocity.
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