When I swapped my lower valance over I removed the whole thing from the car ( top and bottom ) and gently prised it apart
Was much easier that trying to do it on the car and not damage the lower valance as I could see signs of stretching/deforming when pulling it off
It also makes it easier to fit your edition 30 lower as you can make sure all the clips are firmly in place since you can't see when it's still on the car
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