That's part of my quandary. I can do the speakers and probably even the HU and I think I can figure out how to splice things together to merge the component signals together to work with my 3-ways if I feel ambitious. But, if I do the amp too, I'd plan to just run all new speaker wire and leave all the stock wiring where it is. Which begs the question for me of whether it's worth the work of trying to mess with the stock wiring if I'm going to swap out the Monsoon amp at some point anyways. The more I think about it, the more I think I'm leaning towards just chucking it all and running everything new. I just need to convince myself that it's worth the $$ at this point, since it's not like I have a failed sound system (other than one back speaker which started me down this slippery slope).