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4" inner flare port kit
If you dont have this you can expect to get beat by someone that does!! If you understand how ports work they are all about efficiently moving the air in and out of the port. Any edges will create turbulence that will decrease port performance. This is the solution!! This rounded flare will dramatically lower your port velocity and improve lower bass extension and smoother sound.
These are also 1/4" this getting rid of any resonance that the cheap thin plastic ones have.
Kit includes 2 inner flares. They fit over 4" schedule 40 pvc. (1/4" thick walls)