It's not really a "custom" box, but its the box that's made specifically made for the 2 rockford P3's from rockford. And right now i have a power line rated for 3000+ watts that i had made for my truck at my local audio shop in winchester, it has a 200amp fuse back to the 5000k series capacitor that im using. The amp and capacitor came together and like i said, it was kinda a crackhead deal. Guy told me 50 bucks for both amp and cap so i got them, hooked them up and used them for roughly 9 months. I bought the jl from a co-worker and he said the box for it is a labyrinth style box. I haven't had the speaker out of it to see for sure, but yes, it is ported. I honestly would like to keep both of them in my truck. And i dont mind spending the cash to make my set up work. But its like where in the hell do i begin? Should i run 2 amps on 2 sperate power feeds? Do i run a distribution block off my one line? I don't mind spending money but i don't wanna waste it on a set up that doesnt last.