Yea, it's just the new exhaust oil being burnt up. Mine did the same for about a day because I drove it for about 4-5 hrs after install. Think of it like this; once you install the CAI, it takes times for air to run through it so your engine sound won't change immediately. It'll take about a minute or two for you to hear the difference...
Just let it run its course and it'll go away. Once it does you won't even norice it at first unless you're running your car in park/neutral with you standing behind it looking.
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