Vetus rubber exhaust hose is the most flexible hose available, because of the large number of spiral turns and the smooth EPDM rubber. Note that this can only be used with water-cooled exhausts: it can not be used with a dry exhaust.
The completely smooth internal surface of the hose will reduce back pressure in the engine. Temperature resistant between -30º + 100ºC with brief temperatures of 115ºC.