Recently completed Parrot CK3100 install, stock amp bypass using my old system and stock speakers.
Coustic 4x75 running front and rear stock speakers w/ aftermarket 3-way x-over
PPI 2 x 50 running Sony Explode 10" in Bazooka Tube
Sounds really good. I have some engine noise thinking it's because of a few things not the least of which is the amps mounted to the metal bracket for the stock amp. Have to et a piece of MDF cut but that has to wait until the spring and my new house, hard to do it in the condo parking garage!!
Parrot system is great.
Here's a couple of pics of the setup: