1998 Tahoe Sport. Factory it comes with: In the front doors: two - 1" tweeters two - 6" 3/4" Mid/Low ranges. And in the upper portion of the back: two - 4" x 10" Pieces o' crap. **The head unit that came stock must remain. It's my brothers and he has roughly $1000 to spend max. For subwoofers, I think that one 12 or 2 10"s would do fine, but quality is an issue, and reliability because he probably will turn it up once or twice. Any suggestions are welcome....as for my car...I'm happy with the HK.