"The B plugs are what are listed in the owner's manual and the service manual as the "colder"" The B at the end of the 11 is for the longer plug, the 6 is for one step colder. NGK PFR6B-11B (one step colder for TT) NGK PFR5B-11B (stock for TT) NGK PFR5G-11 (stock for na) But all Nissan's i've gone to their manuals tell them the NGK PFR5G-11 is the replacement for the TT as well.
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