This is a Intake Manifold Spacer remix for the EJ20 Subaru Engine (http://www.thingiverse.com/thing:2451310).
There is two Intake manifold spacer on the EJ20 engine ; they are not the same.
The second is the mirror of the first.
On the original download, there only one model (the left piece) ; this is the right piece.
More add-ons
https://cults3d.com/fr/collections-de-designs/dancan13f/subaru-ej20-engine-add-ons
The author marked this model as their own original creation. Imported from Thingiverse.