Re: 2 questions
You don't 'need' and amplifier, but if you want to realise the real potential of the speakers you have chosen, then an amp is probably not a bad idea.
It depends on how loud you listen as an amplifier will produce much higher distortion free SPL and it will sound better doing it as the amp will have better control of the drivers.
All you need is a modest 50wrms x 4 amp and it will have bucket loads of power.
ED installations are very easy.
2 screws hold the plastic facia, pull down and it falls out, and unplug the lights.
To remove the head unit you'll need a torx driver to undo the 2 screws.
Buy the correct plug to mate it all togther and Bob's your uncle.
4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?