What can you add to an BMW M3?
I have a 2004 BMW e46 M3 coupe.
I added a lot of stuff to the interior and the body so it looks great.
But now only thing I have left to do is to add stuff to the engine.
I am thinking about definitely adding
As for performance, go with the twin turbo. The supercharger will tear your engine to pieces, and the turbo, though great, has some lag. The twin turbo will nearly double your hp, and has no turbo lag.
For the handling...buy bilstein





