they're held on by spring push type connectors on the interior side, and double sided tape on the outer facing side. there is also an electrical connector for the lighting. carefully pull up starting at one end on the inner side, work you way to the other side carefully freeing the connectors, once free, disconnect the lighting connecter, then slowly lift the sill to break the double sided loose.
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2016 DIB GT Premium A6, Borla S-type axle backs, Rovos Pretoria wheels 20x8.5/20x10, Nitto N555G2 tires 255/35/20 and 275/35/20, Koni yellows, BMR springs