I know for certain that the quad fits an OEM bumper. The DD diffusers are a little thinner than some others (single layer carbon over some other substrate, I think) and this is a good thing in a small-ish cosmetic piece. They have some flex to them for a better fit, where others I've dealt with are multi-layer carbon and flex about as much as a brick. Stiffness is great in structural bits or large pieces like a hood; but, for this piece, attaching to a plastic bumper, flex is good.
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