Do you have larger midbass also, like 5.25s or 6.5s?? If so, I'd just ditch the 2.5" mid and run a 2-way setup.
But, go to http://www.madisound.com and on the left column click "catalog". Then, scroll down the page till you see "aurasound" and go into there. Then, scroll down about half of the page till you see the "WHISPER" NSW2-326-8A. That would work for you, and at a really reasonable price. I can try to dig up some reviews of that speaker for you if you would like. Here is the spec sheet on it, http://madisound.com/NSW2-326-8A.pdf
thanx for all the help but i allready ordered some 5.25 so i guess ill jsut leave the ones that arwe in there but what does 2 way mean? **** bmw's.. its such a badass car thoufh