side skirt

Does anyone know if reiger carbon look flat or deep version side skirt for E46 3series will be direct bolt on, add-on or must need modification?

I like two reiger side skirts, and hm.......can't choose, because both of them look awesome!! Rather buy easier to install.......

Also,,flat or deep version........which one will make my car a bit longer...due to modified rear bumper, it looks a bit short............

I want to invite you guy to show my babe at Cornell university~~
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