I am currently retro-fitting a prefab box for two tens front firing in my 97 ext cab; to a single ported RE SX10. I cut off about 6" on the end of the box, added another sheet of MDF over the front of the box to add depth so I could mount the SX10, cut out most of the first front layer out to add some volume, and am doing a siingle 4" external aero port out the side. I might have to add some 90's to get the port done right and not infringe with the volume of the box to get it tuned to 34hz. I'm almost done so we'll see how it sounds in the next couple of days. I will try and post pics.