This is an excellent port for use with small subwoofers. The dual flare almost but eliminates wind noise and the dimpled flare surface reduces turbulence even more. 

The port comes in 3 sections - the 2 flare ends and the center tube. Just cut the center tube to length and assemble! We can cut these for you if you like at no extra charge.

With only the flares combined, the length is 6", so subtract this from the total computed port length to get the center tube cut length.