Those 4 bolts and 2 nuts should be torqued to 13 ft/lbs.
The proper name for that "y-pipe" is the air intake connector. Which attaches to the intake manifold with 4 bolts and 2 nuts. See the 6 holes in that gasket in that picture?
Even the throttle body uses 4 bolts, so I do not have a clue what part you are speaking of that uses only 3 bolts.
