I'll look at the master sheets when they show up, as I can't figure out where to splice into the factory wiring to run the amp into them, or where to put the crossovers if I do it that way. Wiring from scratch is easier to visualize for me.

And I watch them ream people all the time with aftermarket amps in the car (speakers and head units with connectors they ignore). Considering that every department in the dealership hates each other for the most part (I hear it from other places too at training seminars), getting stuff out of another department usually resembles the feeling of root canal. And from what I hear from the other salespeople, I'm well liked in parts and service. Scary.