03 GMC Sierra Bose Sound

You should have no problem adding a sub(s) to the stock bose system, I do it all day long.

You will need an adjustable LOC (line output converter) generally a good one is 20-25 dollars. Tap it to a pair of factory sub wires, if no factory sub to the rear speakers. It will come with directions but if you need any further assitance with install we are here.

As far as remote a concern is the RAP (retained accessory power) of the stock deck (you know it stays on for a while until you open the door) I have had some luck on certain GM vehicles locating this relay near  the fuse panels. If not you can conect it to acc at the ignition harness, or if done properly tap it to an acc fuse but if you can't find the RAP relay or fuse/wire the subs you add will turn off with the key, while the rest of the system will be retained unitl door open. If this is not a concern that'sall there is to it.

If you really want the amp/sub you add to utilize the "RAP" and you can't find it on your vehicle post back and perhaps someone else here has had sucess. You can not tap acc directly at the back of the deck, it can't even power a relay but there may be a way to do it with a resistor/transistor setup, but as of yet I haven't had the need so can't advise there.

Enjoy.