The Stilo Side Air system is a 'forced air' intake via a pipe that can direct air into a driver's Stilo ST5 helmet through one of the integrated sideports. This part is fitted into the shell of an ST5 GT and will connect to a Stilo Air Hose (YA0639) or other custom-made air intake system. Please note, this part cannot be used in conjunction with a Stilo drinks kit unless helmet comms are not required and the port be used. If drivers are wanting air and drink systems we suggest using a top air accessory instead of side air kit. For the bottom edging trim on an ST5, see part number YA0874.