So. Guess I need technic pnp harness
https://technicpnp.com/product/7ch-h...hk674-harness/
I guess this just plugs in boot where amp is and then use harness to feed MS8.
Then oem speaker cable adapters and speaker rings to replace speaker in each location.
Would 2x 4 ch class d amps suffice, something like alpine pdx range?
I guess there is always using ms8 amps for the rear fill speakers.