Thanks to all for the replies. Btw, they are the 12W3-D4. Im thinking just wire the coils series, si I get 8 ihms/driver then build them up and try them out, can't hurt. I'm certain my friend wouldn't care which application I choose, we had many very long audio discussions over the years and he knew how picky I am about audio. I do my homework most of the time, but I think this time I'll just have to wing it. If the subs don't dial in well, then I can always upgrade my truck. Thanks again for the replies.