XTERRUSS5:

They don't make the FIPK for the Xterra. It's the Aircharger only which is designed for offroad (Per K&N) but which passes smog in many states. Once they get it smog approved in Ca, they are suppose to add it to the FIPK. I've been waiting for the last 7 months since I bought my X. Many others have been waiting for a couple years. They don't even have the Aircharger for the SC Xterra. But they do have one for the SC Frontier. Someday, probably when I have retired to a South Pacific Is., they will come out with an FIPK. But by then we will be using fuel cells and won't need the damn thing!