Precision Port 4" Flared Port Tube Kit

Same as a PNR Port or Aero Port. These give you much cleaner bass than regular ports and raises your decibals. I used one port for One High Excursion 600W RMS 10" and it sounds great now i just need a bigger amp ;-)

Great Product !
They have a website at http://www.psp-inc.com/tools.html that will calculate the total length of the ducted tuned port. The first number is without the flares attached & the second number is with the flares attached. The difference between the 2 numbers is the length of pipe you need to fit between the flares!

These ports do the job. I had 2 12" Polk momos in a sealed box in my car. I decided to buy a pair of these and port a larger sealed box I already had. Installation was simle, if you have a drill and a jigsaw. The hole needs to be very large, it is actually the same size as the inner flare, as you use that as a template. Instructions include the math on how to obtain the correct length of the tube, but you need to know the volume of your box and the desired frequency you want the tube to be tuned to. I don't hear any port noise at the max volume I listen to.