I need to know what you guys use to mount the rear splitters. Just got a set, and I have no clue what to do haha

Use the mudguard bolts and lots of Double sided tape.

Alight sounds good! haha
It doesn't matter that much if they aren't perfectly flush in some areas, right?

i have the same set from dustin, you need to drill holes in the splitters when you have them lined up and then there are screws that are already in the car that will work, this is what i did, i used no double sided tape at all, make sure you get the fitment right before you even think about painting them incase there are some imperfections

I used screws, but where there aren't screws, I reinforeced it with double sided tape...just to make them extra secured.