Your speakers are not emitting sound properly, or are not emitting sound at all.
The volume may be low. Try turning the volume knob or pressing it in to increase the volume.
If a fuse is blown, the speakers will be disabled. Examine the fuses to determine whether they are still intact. 2010-2014 Ford Mustang Fuses Replacement
The speaker may be disconnected, check behind the center console to see if wires are all intact. Disassembling 2010-2014 Ford Mustang Center Console
Your car is having difficulty turning, or the steering feels unusual.
The tire may be flat or low on air. Check tire's pressure and replace tire if necessary. 2010-2014 Ford Mustang Wheel Replacement
Go to a local shop with your car and have them check if your car is unaligned. Most car shops will perform this check for free.
"When you step on the accelerator your car is not going as fast as it used to"
The air filter on your car may need to be replaced. See this guide to learn how to inspect and replace the air filter. 2010-2014 Ford Mustang Air Filter Replacement
"The front emblem of your car is damaged and you wish to replace it."
Replacing the front emblem of the 2011 Ford Mustang is an easy process and will return your car to its former glory. 2010-2014 Ford Mustang New Front Grille Emblem Replacement