I had this idea while sitting in my buddies wakeboard boat. On the boat they have these heater tubs that extend out of the vents about 6 ft. I want to do something like this for the two center stack vents.

I found the actual parts on eBay but im curious if anyone knows where i could get this type of extendable tubing? I really have no idea where to start.
http://cgi.ebay.com/ebaymotors/HEATERCRAFT-HOT-TUBE-only-w-VENT-Black-H-521-B-NEW_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2 Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3 a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem 130268948282QQitemZ130268948282QQptZMotorsQ5fCarQ5 fTruckQ5fPartsQ5fAccessories

Im just out of money to do major mods to my Jeep and I'm a nice person. I like to think i'm considering my passengers well being.