Installed the Volant CAI yesterday. I'm curious what others have used to block off the extra round hole on the side, as well as the horn cutout on the bottom. Spent an hour at Home Depot and Lowe's yesterday, could not find any type of cap or plug that was even close, either too big or too small for the hole on the side. In the end, the guy at HD and I came up with a solution, bought a foot of pan liner (PVC liner for a shower base), cut a section for each opening, and to allow for drainage (plan on a snorkel in the future) left a 1" section uncovered at the bottom corner. Any other ideas, checked today and my idea is failing, the adhesive/sealer I used is not holding up well.