Here is my input. On my 2012 with Alpine audio, for about 3k I did a Kenwood Excelon HU, Alpine PDX V9 amp, JL audio stealth box, Focal IS165 components and IC 165 coaxial for the rear door, PAC audio adapters to retain rear camera and steering wheel controls, plus wiring and mounting hardware. Best route to go. Best sound and nice clear audio signal from the HU to the amp and the Focal speakers are amazing. So nice clean and crisp.