well for a sub box im still up in the air with that due to me not sure what sub i was going to run, i was thinking of a DD3512 or RE(read that they were awsome as well) been told that either of these subs you would want them firing up and ported up, but still not sure. for real fill i dont car what size just just anything that looks and sounds ok. Was also thinking screw the rear fill and just get making some kicks with a component set, and some good 4x6 plates in the dash