Mercedes Benz A-Class
Removing the stock HU was an easy task with the Mercedes extraction keys. I replace the HU with a Pioneer 9050 (Japan). It's very similar to the 9200.
This is the battery and all the wires and fuses.
Again the battery and all the power wire and speaker wire.

Front of the A-Class
The system:
Pioneer 9050 HU
Pioneer CDX-670 6 Disc CD Changer under the back seat.
Pioneer GM-X944 for front and rear speakers (75watts x 4 at 4 ohms) under the back seat.
Infinity Beta Digital 300 (300watts x 2 at 4 ohms, 1000watts bridged at 4 ohms) in the trunk.
Infinity Perfect 6.1 at front in stock locations. (Custom pods for mounting the mid-bass)
Rear stock speakers.
2 x Infinity Perfect 12"
8AWG wire from battery to each amp.
with 60A fuses (1 for each amp)
More pictures of the system to come...