NGK Spark Plugs HEMI (5.7L, 6.4L)

*Select if your vehicle is SUPERCHARGED or NON-Supercharged before ordering* NGK Iridium IX Spark Plugs - supercharged vehicles (16-pack) The Spark Plug serious enthusiasts rely on. Designed specifically for the performance enthusiast with supercharged vehicles! Iridium IX offers extreme ignitability, improved throttle response, and superior anti-fouling. We recommend the Iridium IX spark plug!  These are a great addition to upgraded RIPP high-performance coil packs!  We've conducted extensive tests on the NGK Iridium IX spark plugs, specifically on a supercharged 5.7-liter Dodge Charger, and the results have exceeded all expectations. In a series of impressive 90! back-to-back dyno passes, we pushed NGK's technology to its absolute limits. Despite the rigorous testing, the spark plugs showcased unparalleled resilience, displaying minimal signs of wear upon removal. They can be used with or without RIPP coil packs.  Each order includes 16 spark plugs.  Pre-Gapped @ .032 (supercharg