Replace it when it warps but until then enjoy the most functional, light weight, durable, relatively low profile, cost effective splitter for our cars. I truly love my lip but like you, I have fears about it warping at times. Driving at highways for extended periods of time like a past poster wrote. It sucks that you don't feel 100% confident on the product. It may very well be installers fault on why certain lips warp but can you blame them if they followed manufactures recommendations and used the kits hardware? All I can say with complete certainty is that you CANNOT use Stillen's hardware for installation.
Stillen may have a design problem as I don't think it's the actual material. Urethane is highly durable, light weight and sturdy. Our bumpers are made out of it and you don't see those warping overtime.
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