Want to add an amp to my car and keep the OEM radio

[yamawho]

I have a 2010 Malibu with 6 speakers and I would like to add an amp without changing the head unit.
Might want to add a sub but don't want to deface the interior.

Not sure about going the bestbuy route ... where should I go?

[lowfat]

Do you feel comfortable doing it yourself? It really isn't all that hard if you have basic electronics knowledge. You will need an amp w/ high level inputs or a high level to low level adapter. Just solder on some wires from your rear speakers and bridge them to the high level inputs on the amplifier. Or disconnect the rear speakers completely and run those wires to the amplifier. Run the power, ground, and remote and you are pretty much done. You'll need to run the remote wire in to fuse box more though since you don't have an HU that has a remote wire out.

[yamawho]

Found some videos here ...
YouTube - Amplifier Tips : OEM Car Stereo Intergration

Don't know enough to pick the equipment required ...