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What's also good is if you check out some road construction in your area... I saw what appeared to be 10" or even 12" piping. Was tempted to grab a few scrap pieces to see what I could do with them!
^^^ you are absolutly right. i have 12" stuff that i was able to mount a 12" sub into. this was back like 8 years ago! i had a jbl gti 12 that i used. sounded amazing. go figure?
Going to have a hard time finding plastic pipe over 4" at HD, Rona, or CanTire. Try looking in the YellowPages under Pipe Wholesalers. Some that come to mind: EMCO, Bartle & Gibson, Andrew Sheret. It will likely be blue, green, or white.