if it says Kicker Custom, did it come out of a Dodge? Kicker is making the "audiophile" system for dodge now and they stamp the cones "kicker custom". if that is the case, follow the specs for the l5 box, but shave another 1.5-2" off the length. also, dont put more than 200-300 watts per sub. That is of course if these are indeed the dodge subs. Kicker produced a special line for dodge which, performance wise, is about like a CVR, only Square. not a bad system for "OEM"