That is a product which is used extensively in aircraft. Probably the most popular brand is Aeroduct. There are several grades, however, the orange color indicates this is either 'SCAT' or 'SCEET'. They both are made from a silicone impregnated material, for use in temperatures from about -70 to over 550F. SCAT is made of a single layer with a wire inside to hold it's shape. SCEET has an inner and outer layer with the wire between them. We have used both kinds for intake ducting on all sizes of aircraft. Maybe SCEET is a superior product, but we use mostly SCAT. A good source is: Aircraft Spruce, toll free line is 877-477-7823, or
www.aircraftspruce.com. Pricey, but good stuff. Hope this helps. That's a wild intake system!
bc12dJohn
'86 SE, L67
'46 Taylorcraft, BC12D (airplane)