never over kill , theres not a lot of room in there for the proper box you need. each sub has a recomneded box and vent size, ( or just sealed size ) so they wont sound like they would even if you put them in a hatchback, and i had 2 pioneer 10s and 2 poinner 12s in a reg cab 90 cheyenne sounded fine with wal mart 4x6s