Look under and near the air filter box.  It is attached to the body
with two bolts.

Extra info:  the pipe fastener at the top of the filter (outlet) is a
17mm banjo-bolt.  The bottom pipe (inlet) is attached with a 14mm flare
nut.  The flare nut can be difficult to break loose.  Use a flare
wrench and a prybar for initial leverage if needed.

Sometimes the nut has been tightened so much that the filter threads
distort, making it tight the whole way off.  Once you replace the
filter, the line should thread back in much easier.

Toyota MDT in MO