Air Guide, Removing And Installing, A5, RS 4 And RS 5: Installing
WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order of removal and note the following:
-- RS 5 before product improvement: when inserting the mount must engage in the guides on the spoiler lower section on the side -4-.