WARNING: This page is about a different car, the 2016 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Install the air hose as shown in the figure.
Fig 1: Identifying Air Hose Installation Position (Throttle Body Side)
Courtesy of MAZDA MOTORS CORP.
Fig 2: Identifying Air Hose Installation Position (Air Cleaner Side)