Don't have the part # for the factory air filter, but I am happy with my green filter. Can't see how it would have any affect on warranty... my guess is that a dealer who would void a warranty because of an OEM filter replacement would also void your warranty claim due to not having dealer service records for oil changes. It would be a _very_ extreme warranty denial. Drop in a green filter, enjoy the enhanced supercharger whine (it is noticeable) and forget about it.
I have a green filter I can sell anyone that wants it. It has 1400 miles on it. Selling because I went to a Bwoody. I can do $50+ shipping. PM me and I will send a picture when I get home from work to anyone that is interested. Just provide your cell # for the texted pic.