I just finished installing a complete stereo with amplifiers this past weekend. While it took a lot longer than expected, part of that was inexperience and part of it was definitely NOT RTFM(Read the Freaking Manual). Also I did have to consult youtube a couple times to figure out how to pop a panel or console.
But alas she is finished!
So this is the coolest part I think, besides the sound:
Above is the metra 99-5823CH with a Pioneer DEH-7200P
For the speakers I used Infinity Kappa 6 x 8's with a crossover built in. The rear ones are hooked to the amp, however, there was no good place that I would see to run the front speakers. The door piece that conencts the existing wire is a real PITA. For now, I am runnung the front speakers off the head unit and capped the RCA cables that go from the head unit to the amp for those particular speakers.
The sub I bought the pioneer shallow mount 10, and it fits nicely in the trunk spare tire well.
I routed the Power wire on the drivers side, and the RCA cables on the passenger side. The ground wire I hooked to the mounting bracket for the backseats. It was the perfect size, i might add. Both the power and ground wires are 0 guage into a fuse for the power on the amps and a ground distro block for each amp.
I used an autotek mean machine 2500.1 for the sub and turned down the power. For the speakers, I used a hifonics 170 x 4 amp.
The sound quality is awesome! I used the built in high pass filter on the head unit to cut the frequencies at 100Hz and the Sub at 53Hz. I have no problems with turning up the stereo and everything staying clean.
EDIT: one thing i did not mention is that where the head unit RCA cables are, you may want to get the elbow RCA connectors because regular RCA cables can be a tight fit. There is a crossmember bar that lines up perfectly with the head unit; at least on a single DIN unit.