"Of the many factors that can affect the handling of your '02, wheel camber is one of the most important. You can spend a large amount of money on tires, wheels, shocks and springs, and sit back and wonder why "lesser" cars continuously outpace you on the track. Chances are, they are just set up better, and part of this setup is getting the camber right.
Negative camber is when the top of the tire tips inward, and positive is when it tips outward. Negative camber is necessary for good cornering performance. The main question is how much. When turning a corner the body rolls and the outside tire is forced to tip outward in relation to the road. This causes the tire to ride on it's outside edge and lose grip rather than being flat on the road. I refer to this as body roll positive camber.
To maintain the best grip we would like the tire tread to remain flat on the road. To compensate for body roll camber change auto manufacturers design in some negative camber. Again the question is how much is the right amount. To improve cornering performance and reduce body roll camber change most tuners (us included) increase roll stiffness via stiffer springs, sway bars and lowering the body (lower center of gravity).
Increasing negative camber is one of the most effective and inexpensive ways to improve handling but is often overlooked on street cars. Negative camber in the 2 degree range will have little effect on tire wear but can have a dramatic affect on reducing understeer.
Insufficient negative camber is the reason many driver school students destroy the outside edges of their front tires. For perspective, the front suspension of race cars are usually set up with 3 to 4 degrees (or more) of negative camber. However, this much negative camber would quickly wear out the tires of a street driven car that spends most of it's time going straight."
When I lowered my car, the dude who did my camber set it at .9 degrees negative camber- my tires allowed for 1 degree. The wheels looked like they had "mexican sag" so I took it back and he adjusted it to .2 degrees. you can still tell by looking that they're not tottaly straight, but it won't hurt the tire and will help my handling a bit, so what the hey..