NGK
Iridium IX Spark Plugs (HEMI 16-Pack)
Bolt-onStage 1
$50.8
Engine & Power
View in catalog →The engine is the heart of your Challenger — every performance mod either helps it breathe better, burn fuel more efficiently, or force more air in. These upgrades range from simple bolt-on air intakes to complete supercharger kits. Even small changes to how air and fuel get into the engine can make a noticeable difference in how the car feels.
Spark Plugs & Ignition
Spark plugs ignite the air-fuel mixture in each cylinder 40+ times per second. Better plugs mean more consistent combustion, smoother idle, and better throttle response. The HEMI has a unique dual-plug design (two per cylinder = 16 total), so plug changes take a bit longer than most engines. Modified engines often need colder-rated plugs to handle higher combustion temperatures.
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