2015 GT Performance Package Driver's side controller
 

Hi All, potential new buyer of a 2015 Mustang GT with performance package. I noticed on the pictures that there is a controller button of some sort on driver's right side. I am wondering if anyone knows what this might be. I'm guessing they've done some sort of engine modification but they don't have any pictures of the motor so it's difficult to tell. https://cimg1.ibsrv.net/gimg/mustang...aebc25afb6.pngAny idea what this control button does?
If you do recognize it, do you have any concerns with purchasing a car that has this mod? TIA for any input!

You sure it's not just a subwoofer amp level knob?

We can't see the words on the device, so let the guesses begin...

Possible knob possibilities

Sub amp controller
Suspension firmness controller
Fuel tank switch, regular to race gas.
Manual turbo boost controller
Exhaust cutout controller for running open exhaust
Zoom-Zoom Noise enhancer
Nails out the backend tailgater eluder (one i've always wanted to have!)
Alien tracking enhancer

Ask the seller maybe....? ;)