I finally got this installed today. I have to agree with others who have said that there seems to be a perceptible difference in performane and engine sound. I also found the paper sticker floating around in the air box that others have mentioned. It's definitely worth opening up the air box and taking that out even if you're not planning on changing the filter. A quality control miss for sure.
If you're on the fence about upgrading the air filter on your Sport, I say go for it. Even if you have zero experience working on cars, this is a simple and affordable upgrade that will not void your warranty.