So I just picked up a JL 13w6v2 and I would like to make a ported box for it. The vehicle it will be in is a Chevy Cobalt and powered by a JL 500/1. The ported box that JL recommends is 1.875 cuft tuned to 31.5 Hz. The dimensions are 18.875 x 16.5 x 18.625. Just wanted to know what people thought of this box. Go bigger? Tune it differently? Any suggestions would help.