Originally Posted by kokgo20
What's ur email? i have a friend that is interested, will they fit M3 E46?
As I've found out, the calipers are model specific. So you'll need to call Stoptech to see if the E9X M3 kit uses the same piston sizes as the E46 M3.
Stoptech uses piston size to tune the brake bias.
Not to mention the rotor hats are car specific as well...but might work on an e46.