Shop vac hose is 2 1/2" ID, plain black, crush resistant, yet pretty flexible. Theres barely room for it in the fenderwell, but if you trim a little under the fender liner you can get a pretty straight run up into the engine bay. Cost about $18 for a 6' section at Lowes/Home Depot. BAT sells a similar setup. Theres a pic in their catalog if your interested.
