hello.. i had a couple questions.. currently i have a factory casette HU and an alpine 6 disk changer.. a JL 15" w0 and a crossfire amp.. i was either gonna sell my changer to buy a head unit.. or keep the head unit and wire it to the factory.. i read the thread on wiring to factory. but i was wondering how hard is it to do?? also, wut's the difference between having one pair vs two pair of RCA outs.. and what's so good about having a sub out on my head unit if i can just get signal from rca?? any suggestions on what i should do? thanks..
also will this do it all for me??
http://www.crutchfield.com/S-n3Do61Z...27OEM2&o=m&a=0
like just buy this and a streetwires kit for my amp??