 Caliber SRT-4 Spark Plugs
After reading several of the NSRT posts, people that have tried all the different types of plugs, the NGK Iridium IX was the best choice. I'm sure there will be people that disagree. However, i put a set in.
Truely, smoothed out my idle. Seems to run smoother. Gapped at .040
Iridium IX NGK 2477
Stock Plugs
NGK ZFR5AP - Platinum |