I've noticed lately that the rear of my 03 sedan has major neg camber. Is this normal? What could be causing it if not? I have also noticed more road noise/howling lately and feel that there's something wrong. My brother has an 03 and his rear tires seem to be straight up and down.

 

I'm not a car expert, but maybe your shocks are shot? How many miles are on it?

 

A little negative camber is normal for these cars. Without it, the car could even more squirelly than it does now in tight turns. If you have excessive rear, the camber bolt may be off a bit, but I think that is highly unlikely. Chances are, the difference in camber between the car can be:

1) Different wheel/tire sizes (larger/wider tires/rims will show more camber)
2) Different road surfaces. You need to be parked on a perfectly flat surface to compare camber.

 

60k miles on the car. The other thing i noticed is that car sits a little lower than my brother's sedan(non sport). The car has the original (non sport) springs and shocks.

 

Sounds like you may want to have it looked at. Like DaveB said, a little negative camber is normal but you say "major" which is not. Check for bent support arms, etc.

 

that's what I'll do... Thanks!