I just got my iCarbon diffuser in the mail a couple days ago, installed it yesterday, and Im not happy with the fitment at all. There are 1/2 inch gaps on each end (right side and left side). I had the install video playing on my iPad right next to me during the install, my diffuser didnt "snap in" at all.
It looks like yours fits perfectly, so I'm not sure what the deal is on mine. Just my luck