What optional feature is available to enhance the sporty appearance of the QX55?

The optional feature that enhances the sporty appearance of the QX55 is the black roof rails. This feature contributes to a more aggressive and sleek look, aligning with the overall design philosophy of the QX55, which aims to combine style with a sense of sportiness. The use of black contrasts well with the vehicle's exterior color, creating a bolder visual impact that appeals to customers seeking a sportier aesthetic.

Other options, such as chrome accents and leather interior, tend to emphasize luxury and comfort rather than a sporty vibe. While these features are desirable for their elegance, they do not inherently enhance the sporty appearance in the same way that black roof rails do. Additionally, a sport-tuned suspension primarily affects the driving dynamics and performance rather than the vehicle's outer appearance. Thus, the black roof rails stand out as the feature specifically designed to enhance the sportiness of the QX55.