Last week-end I installed the Focal ES 100 K comp set, and 2 8" Focal subs/midbass under the seats.
I absolutely need to install the amplifier : an Audison AP 8.9 with buil-in DSP, and all OEM interconnections and wires. I know it may not be the best, but it will do it for me.
I put some Damplifier pro on the doors, but I had LLP for my old car and I din't use it. I hope I will be able to use it in the trunk. That was not cheap, I must use it somewhere !