As an early Christmas present my dad bought me an 06 mustang and I discovered that it has a sub+amp (the amp is a pioneer prs x320) in the trunk (the sub is blown btw) and I had noticed that it didnt look like it was hooked up right and i did reasearch and the shaker 500 isnt supossed to have a stock sub in the trunk, so my first question is, is this a stock addition to the car or was the put in by the previous owner. And 2, I posted pics below and if anyone can tell me if it is hooked up right that would be great, and whether I could buy a different sub and just replace it or would it need more work based on how badly the previous owner screwed up. Thanks for the help in advance