Thank you Wayne. I think I am going to start with the motor run. I rarely hear of anyone hating them in crossovers, and for the money, it is one of the most economical places to start.
The trick will be deciding how to mount it, since the stock wiring is inside the box. I guess I could clamp it to the side of the speaker not insulated or maybe use some zip ties to keep it upright. I will report back.