I have an infinity Kappa Perfect 12 " sub from my old car. The box it is in, a simple box I bought at Circuit City, does not fit in trunk. I was going to build a simple one cubic foot sealed box. What is the depth under the rear deck of the infinity g35 coupe? I have an 04 coupe with bose stereo. Just looking for a little extra kick to the low end. I figured I have the sub, why not figure out a way to do it, with out spending a bunch of money for a fiber glass molded box........