What kind of spark plugs does the X use?

For the 3.3L V6 (VG33E) engine, the standard plugs are NGK "Double Tip Platinum" PFR5G-11 (nominally gapped at 1.1mm/0.043in).

For colder, use PFR6G-11 and for hotter use PFR4G-11 plugs.