The Mustang GT (V8) did come with ABS in 2005.

None of the 2005-2009 generation V6's (non-GT) came with ABS unless they opted for the pony package on 06-09 years, or the optional V6 Security and Safety package from 08-09. This is a V6 without the pony package (although, the 17" wheels are from a GT/pony package), so highly likely no ABS.