Easily Add 2 Degrees of Negative Camber to Your E46 M3 by Swapping Strut Hats 

Every E46 M3 owner that enjoys performance driving should stop what they're doing and swap the strut hats. This modifications swaps the left and right strut hats, and when oriented correctly, should increase negative camber by 2.5 degrees or so.
The swap costs nothing but your time, and can be performed in under an hour. Once the wheels are off, the required tools include a 13mm socket to remove the struts from the strut towers, 17mm wrench and socket to disconnect the end links, 18mm socket for the lower strut bolt, and a 22mm socket to remove the strut hat.
It's incredibly easy if you have coilovers. If you don't, you'll also need a spring compressor.