My wife and I are "debating" whether or not having a NAV/DVD stereo head unit installed in our 2004 Seq will void the 3 month, 3,000 mile certified warranty. I say no, she says yes. Does anyone have a clear understanding of these mods effects on a warranty such as this? Also - I have been a Ford F-150 guy for years now and the wife and inlaws are pure Toyota Fanatics. After selling my 2004 F-150 (first child on the way) a month ago and getting this 2004 Seq LTD, I have since repented all my Ford sins and LOVE the Toyota!!!