cool little thing I noticed on my frs
 

Both wheel Wells, have slots to slide a body kit in and to screw them into so no drilling on the car itself! Really cool if you ask me, pics up tonight!

Is this why I have holes in my rear fender liner (on the side of the liner thats most towards the back of the car) without any screws or clips in them?

or maybe for mud guard installation?

yeah probably, i have yet to go under my car yet, tuesday im putting it in the air and taking a look to see if i find any cool little things that arent noted in the forums yet

I'm pretty sure they are for mud guards.

FYI...You have to drill a hole to install the rear mud guards! I had the master tech. print out the instruction they use so I could install my own and all the parts are there...except this one hole you have to drill. Gives me the chills...Holes are for the mud guards, but if you look at the bottom of your rear bumper you will see holes for a diffuser install.

Also the fenders are pre rolled to accommodate bigger tires :)

My FR-S has the holes but no screws, is yours the same.

Interesting