New BMW E46 E53 Aux-In Adapter and 3.5mm Cable

The build date of your vehicle needs to be on 9/02 or later.

• Hassle free returns

• Personal service

• Same or next day shipping

Here is an awesome link to installation instructions and compatibility

Better installation instructions and compatibility information 

If you have questions after checking the links above, You Tube is a pretty good resource, I know a little bit about E46, but not other models.