U should have reinforce the bottom of that lip on the Concept/RLM bumper with the expanding foam stuff.

What I did was laid down some resign/fiberglass behind the lower lip, then I use the expanding foam stuff and my lip hold up very good. it has some scraps but and some small cracks but its been reinforced.

Altho I had the RLM bumper for Redline and I heard the concept bodykits.com mold is cheaper and flimsy

 

I did do the expanding foam the first day I got the car back from the shop. it could be worse I guess.