While it's impossible to tell without driving your car, these Mustangs have ridiculous clutch pedal effort levels.
Ford finally got it right with the 2015+ cars, the clutch is 1/2 as heavy. I wonder if the master and slave clutch cylinders from the 2015+ cars can be installed on the 2005-2014 cars to lower the clutch pedal effort?
2012 GT Premium, Brembo PP, MT82, 3.73s, Blk/Blk. Bama 93R, Koni Yellow Rear Shocks, Hawk Ceramic pads, Luxurious & Plush Floor Mats