There is nothing to reinforce the coroplast per se. There is 3/4 of an inch of the stock abs lip below the screws level on which the coroplast rests so it stiffens it a bit. I drove it at 75 mph without any apparent problem.
The air dam unfortunately didn't pass aesthetic inspection from the GF, and while she was at it she stated that everything I do to our car should be invisible, else she does not want it on the car.
So I took her to the letter and removed everything that was on the car. As of now I replaced the coroplast lower grill block with a lexan plate fixed from behind the bumper. It won't be as effective but it's better than nothing. I also cut a part for the upper grill block that will solve the problem I had with pipe insulator.
I nonetheless transferred the air dam to the TDI (MY car) during lunch. I'll start another thread for this car as I'll be reusing the coroplast I removed from the elantra for aero mods on the TDI.
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