This instructable is for people who own a 04 impala with a BOSE FACTORY AMP , since Chevy used several different vendors for the amps im not sure if the wiring will be the same.
16 Wire nuts (more if you plan on trying to get the factory tweeters to work)
The ability to crawl into your trunk and stay there for a few mins
Next unplug both harnesses that are conected to your cars AMP (They will have a tab on the top of them that you need to press down on to get them out)
You can choose to do this several (or any) way that you want. I just took the most direct way of accomplishing this task.
Here is my way.
crawl into your trunk, pull the back seats down if you need to have more room to work with and get your wire cutter/strippers and wire nuts ready
you will be basically be bridging or connecting the wires from the first harness to the second harness to preform this bypass.