Focal splits at the front ( http://www.focalaustralia.com.au/pro...vw-golf-6-kit/) the tweeters are really easy to install, they pretty much just click in. The bigger speakers were a bit harder because they didn't match the holes from the original speakers.
Got a 10' Kicker sub back in the boot. The sub was a ready to install unit (came with box and everything) from JB Hi Fi. It does take a bit of space from the boot but can easily be disconnected and taken out of the car if needed.
They are connected to a mid to high range JL amp
I prefer good quality sound over loud and show off so my set up suits my need.
Overall the whole pack sounds pretty good and I'm happy with the investment.