[mikegett]

Some of the cars have a monsoon amp. If you have the premium speaker package then the external can be found in the rear trunk behind the left side carpet. It bolts onto the frame around the whell well.
List what you have and what goals you are looking for. You have purchased subwoofers but do you have a amp or were you looking to use the factory to power them? Are you changing front or rear speakers as well? If you ara planing on keeping the factory speakers then I would keep the factory amp installed. It will always help to list if you have the original Head Unit or a aftermarket. If aftermarket what model. Don't be afraid to ask and and try to be as specific as possible. The more info given, the better the reply can be.