No trimming for the underside or bumper? Just drilling then put on ?
Yes, that's about it.
This last one I just put on, I found out that they drilled two holes differently but that is no problem.
I came up with an easer way to install it that requires NO cutting or trimming of anything.
Remove the two outboard bottom 7mm screws that hold the black fender trim on.
Tuck the trim piece just above the bumper cover instead of on the bottom and reinstall the screw.
Then you need to drill holes into the bumper cover through the 6 main mounting holes (3 on each side) already provided on the splitter.
Next use plastic expanding nut inserts (like used for license plates) with the correct style screws and fender washers.
Dave