I sent you a PM in regards to where you can get it, but I thought I would post here as well on my thoughts...
The "standard" exhaust temperature for a gasoline vehicle at idle is between 200-300 degrees F. Diesel tends to get hotter in the neighborhood of 4-600 degrees. (Sorry for those of you outside of USA, but I don't feel like doing the metric conversions, even though it would probably take less time to do it than write this sentence...)
Plastic hose is usually rated for only about 150 degrees (maybe 200) and will almost definitely melt when left on a vehicle that has been running for a while. Not recommended..(The hose is usually only about 1-1/2" in diameter as well and many vehicles have 2-3" exhaust pipes as standard)
Even with rubber hose that is rated for the proper temperatures (Crushproof Tubing is the only domestic manufacturer any more) it is recommended that you get a larger hose than you require OR use a tailpipe adapter that will allow some ambient air into the hose to lower the temperature.
Some of the hoses (like the flarelock design) can be screwed together without any adapters.
If anyone is interested in a group buy on garage exhaust hose and accessories, I would be happy to see what we can put together for you.
Best Regards,
Frank
www.standardus.com