I don't know if this has ever been discussed here before but, here I go. I had to get a replacement air box lid for a 2018 5.0 Roush CAI. After talking with the sales rep at Roush I found that the lower air box p/n is the same for all 3.7 and 5.0 cai's back to 2015. So, the lid from the newer 2018 cai will fit the older open cai back to 2015. It's a bit pricey (116.95) but, if you want a closed cai intake, it will fit the bill perfectly. You will need some hardware (M6x25 self tapping screws or the equivalent).