I too am interested in this. Im probably going to buy the JL stealthbox and will need an amp to power it. Im not sure and I hope somebody can confirm..... If your only putting in a sub, can you just use the two sets of wires going into the stock sub and hook them directly into the speaker level inputs of an aftermarket amp. You couldnt do that if your running your speakers off a new amp because the factory sub wires are not full range. If your aftermarket amp doesnt have speaker level inputs you probably would still need the PAC convertor to convert factory sub wires to rca. I imagine you could use the factory sub wires if your only installing a sub, correct? I hope this makes sense and I hope someone out there who has added a aftermarket sub allready can confirm. Oh.... Is the 12volt outlet mounted near the sub ignition switched?? If so you have a switched amp turn on. If its hot all the time I guess you have to find a turn on wire elsewhere.