Thanks for that info. I've already upgraded all the speakers in my car. I've already invested about $2,500 into my system. I have some very powerfull subs (peak at 1,000 watts), I think I just need to get them some more power. The main thing is I want to eliminate all the rattling in my car, especially in the trunk area.
As for the front door speakers I currently have a dbs component system in there but I'm thinking about upgrade the front doors to some Focals and putting the dbs in the back doors (back doors currently have some polk's). I also want to get a new cd deck, I'm thinking about the Clarion DRX9675z.
But I've been thinking I need to get some body work done as well. So I might make that #1 priority instead of the audio.