The process:

"The System" Installation

Amplifier Wiring:

This picture shows the amplifier in place in the early stages, ready for some wiring work

In this picture, I've poked a hole in a large rubber grommet behind the factory radio (some cars don't have this, but there are other "routes"), I'm actually using a giant zip tie with the loop cut off to "snake" the amp's power wire into the trunk area.

This is where the wire comes out in the trunk.  I'll then route this neatly around the driver's corner of the trunk, then forward along the driver fender, under the fuse panel, and up to the battery terminal, where the fuse will be installed.