I mean really to put it in perspective... 240whp on a 2750 lbs car is still a 11.45 power to weight. That's still good. A 1998-2004 corvette is a 10.6. A 2015 mustang gt is a 10.
Personally I don't see the point in spending double the money on the DHM kit just to take the fiesta st to that level. Note I said I do not see the point, as in its my personally opinion. If you want a fast car just sell your fiesta st and get a 2011+ mustang gt for around the same price of a new fiesta st maybe a little less. If I had $4000 sitting around to drop all at once I'd be in a 2017 mustang gt right now.
Personally I don't see the point in spending double the money on the DHM kit just to take the fiesta st to that level. Note I said I do not see the point, as in its my personally opinion. If you want a fast car just sell your fiesta st and get a 2011+ mustang gt for around the same price of a new fiesta st maybe a little less. If I had $4000 sitting around to drop all at once I'd be in a 2017 mustang gt right now.