Reading thru the manual (luckily available for download, as I don't have a car yet---3rd printing) the ST is NOT rated for towing. Period.
^ Posted -> 01-18-2014, 08:47 PMI can shed some light on this subject. I too wanted a hitch mount bike rack for my Fiesta ST, so I bought a Curt hitch from Auto Anything. It said it fits all 2014 Fiestas. It did bolt up to the car quite easily and was well made. The only scary part was that I had to cut off part of the heat shield between the muffler and the gas tank. Problem is, the Fiesta ST has a different exhaust which kept knocking against the hitch, so in the end, I had to remove the hitch and send it back for a refund. I actually did speak with the folks at Curt Hitch and made them aware of the problem. They said if they ever made a hitch specifically for the ST, they would let me know. Then I had to buy a new heat shield ($30) from Ford and install it. Live and learn.
That's good to have confirmation from one site. On the other forum one person has installed the Curt hitch and another has installed the Draw-Tite hitch. Both fit the 2014 Fiesta ST with no problems with bumper clearance but the while driving and especially in turns the exhaust tends to hit the hitch bar.etrailer.com made an answer page with additional information. You can see it here:
http://www.etrailer.com/question-68687.html?fb=yes