A high performance variant of the E46 chassis was designated the M3.
Going over the options in this picture, A few cars I looked at already had this option installed. If its not installed, and you see the badge in the trunk, the car is ready for this option.
So be diligent, Do some home work, do lots of reading, do some more home work and then some more reading again! The E46 model year ranges from 1999-2006 in North America and is the 4th generation of the 3 series car.
The E46 was a huge success for BMW in all their markets with their record year in 2002 in which they sold over 560,000 units worldwide.
For the most part, its an easy upgrade that you can do yourself should you choose to do so.
The types, one has three buttons in the rear view mirror on the bottom edge of the drivers side.