NEEDSWING- I bought the single CAI and noticed it really appreciated the change for the stock airbox. The water was never an issue with me, but K&N does sell a "sleeve" that will fit over the K&N filter you get. Rob is patient, but he is busy so don't expect split second responses. When I has some questions (I'm sure stupid by experience people's standards), he responded.

K&N - wouldn't be my choice as they don't have a personal touch to working/explaining things to you like Rob did, also you really don't know how much they really looked in to how theirs would work with the XF if they even did.

TVT - well, I can't speak to it. I know there were some issues with others on the forum and yet others felt pretty good; both of which should consider sending you PM's if they want to get personal. I do know the result of some sort of issue has been what seems to be a liquidation of their products or at least his car and other parts; but that could be a wrong perception.


Good luck