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I would definitely place those stickers inside the front door jams, depending how big they are. Preferably I would place them next to all those lexus stickers on the door jams, make it try to look stock. My brother once had stickers in his door jams that read, "Warning, close all doors and windows over 160 MPH." They were real small, and they were in stock letter form, to the average person, or even car sales men no one would ever notice.