I understand you guys are trying to help me out and I really appericate it. I decided that I can do a box under the rear window line alot better than a wall just for two 15s. The only thing that I'm taking to a professional to do is kerfing a piece of wood for me. Had a friend put some numbers up for me, scrambled some ideas. decided I could go less tall wider and better depth and still be able to fit two extra batterys and two amps in the back. Ill put the cut sheet up later. box is tuned to 35hz.