I did my 141db(peak) and now going back to the flat sub box that I had before. The only issue is that the sub needed more room behind the magnets for cooling. So I designed and built this box, heck now I can even go with the Alpine "R" that I really would like to get eventually to get me 1 step closer to all Alpine. I have to remove the spare, but a can of fix-a-flat wil hopefully take care of that issue. I just need to now get some carpeting and be done with it, AGAIN!