Check out this EAS link to determine if you have DSP - http://www.europeanautosource.com/su...mod_id=2&id=11

If you have Premium sound then you need the DSP kit. Take a look at these links as well for install instructions, etc.

http://www.x3world.com/articles/x3/s...nstall-x3.html

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2004 X3 2.5
Premium sound
Premium package
Sport package