Would recommend using a high strength double sided adhesive like 3M or Scotch. Did have a small gap (1/8ā-3/16ā) but Iām blaming that on my inability to line it up completely with someone else and the thickness of the Scotch adhesive tape I used. Ended up putting weather striping to close the gap and it looks pretty good now. Overall the product is awesome and definitely gives it a good look. Ended up buying a rear diffuser to match. The color matches perfectly with the stock rear spoiler (satin black).