The air scoop is held in place with 2 x 24mm long bolt with allen type heads that are 5mm. Under each, is a split washer. The air scoop sits on a grey rubber gasket. the bolts pass through the air scoop and fasten down in to the top tabs of the air filter box, which is threaded for this purpose.
Simply remove the bolts with a 5mm Allen Key
The Air Scoop is stamped:
1991.6019 (F.P.) 2 (on the inside)