I just bought some Atturo's. They might be crap, but I got all 4 19s for under $500. A few others on the board got them and said aside from being a little noisy, seems to be ok. They don't seem to be available through most retailers so I found one in CA that had them. I'm not sure if I can post the website via forum rules.

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2005 x5 4.4i sport