I've got a 2004 Ram 1500 and I am considering adding amps to the factory Infinity HU. Is there any information on how to wire this? Is there a bypass harness available? Where would the amp be located so I can get to the speaker wires after the amp?

One idea is to install a crossover and two amps to run all of the speakers plus a sub. The other idea is simply to add an amp to power just the sub.