All the info you'll need will be in 1 of these threads elite:
2001-2004 aftermarket radio installation
dash kit and harness options
Crutchfield mastersheet, 99-04 Grand Am and Alero
And for information regarding aftermarket electronics, there's a ton of sites that give you the info to make your decisions. Here's a few....
Crutchfield
Sound Domain
Hope this helps bro. :thumbsup:
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Yes it's modded, No it's not done, Yes it's fast, and no you can't drive it. **On a good day, my car has two blowers. 
Your car must be fast, you were haulin' ass when I passed you in my 4-door Buick. 
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