Review on 🔥 NGK #6509 Iridium Spark Plug LTR6IX-11 - 6 PCSNEW: Reliable Performance for Optimal Ignition by Ryan Moran

Replaced crappy platinum spark plugs with these iridium spark plugs. LTR6IX-11 have the same temperature range as the original. Ideal for stock or bolt-on vehicles. They are not recommended for forced applications - use the Plug 1 Heat Range cooler for this application. They come with a default spacing of .040" and I left them with that spacing even though the standard spacing spec says .043". The engine runs much quieter up to the red zone, and even small stutters when idling are eliminated. Can't tell if there is a difference in mpg increase as I've only driven it about 60 miles. So far, so good.