I have a JL Audio 250/1 in there powering one of these:

http://mobile.jlaudio.com/products_e...=9&prod_id=422

And I think it sounds great. I like the fact that it rear fires and the accuracy is top notch.

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Previous: 2002 X5 3.0 / 121,000 miles
Current: 2007 X5 3.0si / 93,000 miles