I have the premium but looking to upgrade the factory door speakers..I will consider the rear as well but door panels first. Budget is up to $100, no other changes planned to shaker system.
$100.00 will definitely upgrade what you currently have. Seen some really nice Infinity Kappa's on Amazon that were under $100
2011 SG Mustang Premium V6, MCA Edition, 3:31 Gears, 6 MT, Reverse Camera.
Steeda CAI, BAMA Tuned SCT, GT Fascia, Boss/CS Valance, Boss Front Splitter, Saleen Grille, Roush Splitters, GT500 Rear Valance, Roush AB, Black GT500 Wheels (18x10 Rear/18x9 Front), GT Front Brakes, Eibach Sportlines, Eibach Adj LCAs, J&M Adj. Panhard Bar, Steeda STB, Grabber Pony SG Shift Knob, Custom Perforated/Striped leather shift boot and E-Brake Handle boot, SR Performance Shifter, Barton Shifter Bracket