I did have it up on the Dealers ramp to have a good look but cant recall the exact detail.Already looking at the K&N option.
If you are considering replacing the OE slab air filter with K & N equivalent (as many have) please note you need the earlier 3.7 V6 Mustang version, 2011 - 2013, to match airbox. I believe this is part number KN #33-2431.