2 Rockford p1 15's Ported box build... looking for some info as to what I should tune the port to and where can I get some box builds or even pay for some looking for a slot port going in a 96 chevy ext with no back seat I am thnking its gonna be around 6 cubes because they require about 2.5 for each speaker so with the displacement of the port and speakers I think 6 cubes before all that would be good