Subwoofer tubes

I want to put a set of subs in my car. instead of a normal box enclosure i was hopping to use a clear tube. my inital thought was to use some thick acrylic, but most of the qoutes i get were $500 for the tube. anyone have an idea? maybe a giant pvc or abs pipe? also ive seen someone use a really thick cardborad tube for his home stereo subs. any thoughtson how other materials would work and how much it would be?I had Cheetos and wine for dinenr.

You could use that same tube that they use for putting cement in for a mail box or post. They have it at Home Depot. I think it's called sonatube?Sound Pressure

You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!

I saw a tube setup like that recently and the guy said he had an aquarium fab shop buid him one which was around $200boom, boom, boom boom....