I want to replace my stock HU but can't decide which new HU to get. I have a 2003 Tahoe and I was looking at Alpine CDA-9886? Looking for a HU that as at least 2 or more Preamp outputs because i want to hook up 2 pairs of speakers and 2 10 subs. I have 1 4 channel amp and 1 2 channel amp. If there are Tahoe owners here that can chime in it would help my decision making I would really appreciate it. And I plan on doing the install myself....Is there a link to a step by step guide in doing a full audio swap? Thanks! Im glad I found this Forum!