I think you have to take off the stock ones b.c you have to use the clips that are held on with the oem (blackish grey sideskirt)Correct me if im wrong
I think either way, it works, but I took mine off. If you have SH sides you could probably sell them too. And no, you don't use the stock clips, they will only fit if you have OEM sides.
I took mine off, they fit better. If you leave your oem side skirts, you are going to have a tough time slapping the RS sides over them and might see a little gap.
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