I didnt drill any holes !
I cut the tabs off the splitters with a dremel tool and used 2 inches of heavy duty double sided tape at the top front corner of each side, and if you properly bolt and clip them on they will never move,
here is a diy but this is a hatch and no holes are required to be drilled on the sedan
http://www.rexnet.com.au/forum/index..._1#entry540918

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