I happened upon this site just now. It offers high quality silicone hoses for all types of engine bay applications including (but probably not limited to) heater hoses, rad hoses, intake reducer/expansion couplers, vacuum hoses, INTAKE hoses in sizes to 4.00" dia and lengths of 3'. Colors, seem to be black, red, and blue. None of it is cheap, but the quality seems to be top notch for those dressing up an engine bay.
It may be that this site is already well known here, but I hadn't seen it yet.