I had a 95 GSR and put a setup in it once just to play around. Had a ED 15" sub on a Sony 400w that someone gave me. Just used a prefab box, sub and port firing rear, did about a 141. This was not a setup for competing, just something to listen to. One notable thing I experience with this setup, this car actually metered louder sealed than outlaw, so try both for sure. Also, My civic hatch seemed to meter better if I loaded the sub into the rear driver corner, you might want to try that also.
Don't forget that Honda's at ELD's in the fuse box, so make sure your bypass it or have something on to keep the alternator excited.
I would do sub up port back personally.