Spectre Air Filter Inlet Adapter / Velocity Stack 4in.

Spectre's air filter inlet adapters and velocity stacks are designed to allow you to attach a larger 6 inch diameter flange air filter onto a smaller diameter air intake tube. The velocity stacks are available with different neck sizes, to match 2.5 inch to 4.5 inch tubes. In addition, Spectre velocity stacks also have a smooth funnel shaped inlet that reduces restriction and turbulence of incoming air.

• Adapts a 6 inch air filter to a smaller tube
• Velocity stack has a smooth funnel shaped inlet to help air flow
• Designed to be durable and last
• Does not include coupler or hose clamps