The only speakers I replaced so far are the dash speakers . And amping those with the two front door speakers made a huge difference. I went with a ported enclosure and it sounds good. I have to figure a way to get more bass(air) in the cabin bc the trunk is pretty well sealed and the back of the seats which is made of hard plastic won't let as much bass inside. So I've let the back seat down but only behind the driver side and it sounds really good. All the bass comes in the cabin through there. So I think I'm gonna have to maybe cut out the section in the rear deck that is used for the factory sub, I've looked and its marked exactly where it goes just not cut out. I'm hoping that helps get more bass in the cabin so I don't ride around with half of my back seat down. Not that it doesn't sound good with the seat up just better with it down. My Focal subwoofer is a dvc 4 ohm 300 watt rms. And I'm running my 2 channel amp bridged to one coil @ 500 watts. So I have the gain set to about 300 watts and it sounds great
I had it installed in a ported enclosure with the LC2I and it honestly sounds great. I am getting a great sound now for bass and for now I can live with the door speakers as is. I just need to put something in to ptevent the vibrations I am hearing coming from the tail lights and trunk lid areas