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The shop near me has turbocharger/exhaust hose rated for exhaust, like so: http://www.masterduct.com/vehicle-exhaust-hoses lots of layers of stainless shim stock (foil) and muffler putty would get you a long ways down the road I bet. I hear about 2MPG for those rigs, and they track poorly on...

You might not have something that esoteric, most hose-supply shops sell silicone hose in large diameters for just that application. It's not cheap, like $5 per inch, of course if you are driving a MK48 that's about what it cost you to go down the road. :-)