The "striking" or flared arches are installed on the 4.8i Sport pack with optional 20" wheels. With the standard 19" Sport wheels the arches are not flared. The flares are required in most US States and Canadian Provinces as the law prohihits wheels which extend beyond the body of the vehicle when pointed straight. The idea of the prohibition is to reduce the risk of "riding up" accidents such as those sometimes seen in open wheel racing.

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07 X5 E70 4.8i
04 Z4 E85 3.0