well my parents bought me a passat this weekend...

... and i go to al and ed's to add a sub to my car to find out that they won't do it because it has a "monsoon sound system" and my computer chip for my car is inside my head unit and they don't wanna risk it... but i really want a sub... anyone know a good place to get one in so. cal that is really reliable?... money not an issue anymore... cause i really want a sub.... nothing fancy though... thanks....