loyd, i need your help, i have my type r 15 sitting around still, and although i am strictly sq i would like to make a large ported box for it, that i can just put in once and a while for the odd spl comp...or to use in my buddy's car...but alpine doesn't give any ported box specs.....so i need your help in what size my box and port have to be...i don't know the resonant freq of my car....but some help would be appreciated...or if you don't know, direct me to someone who does...