Hey guys, I apologize if there is already a thread asking about this, and if there is, if somebody could link it, that would be awesome! Anyways, I just got a 2004 GTP with the Monsoon system, and I have an aftermarket HU that I want to put in instead. Now from what I've heard, there's a lot of harnesses that need to be purchased to make everything work right, i.e. door/warning chime, steering wheel controls, etc. I just want to know what all I have to buy to make it work properly, and if its actually worth replacing the stock HU. I've done head unit installs a few times before, but this is more complicated than the ones I have done. Any help appreciated. Thanks!