NGK LTR7IX-11 (6510) 1-Step Colder Spark Plugs (Pre-Gapped) - BRAND NEW This is a brand new set of NGK LTR7IX-11 (6510) spark plugs for the 2015+ Mustang Ecoboost. Bought them to replace on my old Mustang but ended up trading in the car before replacing them. These spark plugs were ordered...