I swapped my front speakers, I only needed basic tools and I think some torx bits. It's a pretty straight forward process, I spliced into the factory wiring. I'm going to eventually amp my speakers but routing new speaker wires to the doors seems like it's going to be a pain.
I will get the harness for $10 rather than splice, but what I really needed to know is which harness, and which speakers/model # are compatible with that factory one.
2011 GT/CS Auto-Security Package, HID, Remote Start.
STEEDA: LCA/Upper 3rd Link, Adj Rear Sway bar, Spyder 20" Rims 11"/9.5", Hood Struts.
VMP S/C w/82mm Pulley, JLT CF Intake, Vortech Max Flow BAP, AFCO Dual Fan Heat Exchanger, FMS 3.31 Gears, Kooks 1-7/8 LTs, Kooks Off Road H-Pipe, GT500 AB's, Baer Big Brake Kit with 14" Rotors, Aeroforce Interceptor Dual Scan Gauge w/Speed of Sound A-Pillar.
Roush Front Bumper, Saleen Front Grille, Custom Radiator Cover/Coil Covers