As with all Rockford Fosgate products the quality of this product is outstanding. I have installed them in the front doors of my E60 2007 5 series BMW with the tweeters in the OEM tweeter holders in the doors. I had to do some modifications to the OEM speaker mouths to fit the drivers but there were no clearance problems. I am powering them with the Rockford Fosgate PBR300X4 and they sound great. The only negative is that the tweeters are too bright (too loud). I first put them out of phaze but they were still too bright for my liking so I eventually muted them by sticking some double sided tape on one half of the tweeter.
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