I have a 1995 Seville STS with bose system and I would like to upgrade my system. Speakers, head unit, an amp or two, a sub box, etc. And I know that some people have had problems with the cadillac cars when messing with this stuff. So I have a few questions. First, will I have trouble sticking new 6x9s in and taking thsoe speakers grills off? Second, will i run into trouble sticking a single din head unit in? It doesnt have steering wheel controls but people have said it messes up your computer too. And how much do those little amps on the 5.25s put out? Thanks in advance for all the help.