Yeah i know what you mean, i bought the GTR R34 Top Secret Front Diffuser for mine and even with out it i sometimes scrape, maybe you need to find a way if you do get the lip ,you can make it removeable so you only have it on certains times for show or on a cruise away from everyday obstacles.Thats what im looking at doing, i spent way to much on the OEM Top Secret Diffuser to have it ruined.