how can i remove the passengers side OEM "side skirt"??

 

Well, im guessing there's screws or those butterfly pop out screws under-neath it. Me and my buddy tried that to his civic after i was done helping him install his exhaust and there was actually a metal "skirt" believe it or not that i guess went into the sideskirt piece.

Go ahead and give it a shot man. Most likely there's screws under it that you can just pop out, then try taking it off from a corned like from the wheel hub