Ignition Coil & Iridium Spark Plugs for Chrysler 300 (2005-2022) 5.7L 6.1L 6.4L V8

High-Performance Ignition Coils & Iridium Spark Plugs for 2005-2022 Chrysler 300 (5.7L, 6.1L & 6.4L Hemi / LX/LD)

Replaces degraded factory ignition components to restore optimal spark timing, resolve misfires, and maximize fuel burn efficiency.

The Stock Hemi Ignition Weakness

The 5.7L, 6.1L, and 6.4L Hemi V8 dual-spark plug design is highly demanding on ignition components. Over time, OEM coil packs succumb to heat soak from the cast-iron block and aluminum heads, degrading the internal epoxy and copper windings. This thermal breakdown causes inconsistent voltage, manifesting as a rough idle, hesitation under heavy load, and P0300-series misfire codes. Furthermore, standard plugs wear their electrodes rapidly under high combustion pressures, widening the spark gap and delaying the critical flame front propagation required for complete cylinder detonation.

The Engineering Solution

This ignition kit upgrades Hemi spark delivery utilizing high-grade materials. The performance coils feature premium silicone boots that resist thermal brittleness and prevent voltage arcing. Internal primary and secondary copper windings are engineered for higher kilovolt (kV) output and rapid recharge times, ensuring a potent spark even at high RPMs. Paired with 16 iridium spark plugs—two per cylinder as required by the Hemi architecture—the ultra-fine center electrodes maintain a precise gap over a significantly extended lifespan. This combination promotes a highly concentrated spark that vaporizes fuel efficiently, stabilizing idle, recovering lost horsepower, and improving low-end throttle response.

Technical Specifications

Compatibility

• 2006-2022 Chrysler 300 5.7L V8
• 2005-2010 Chrysler 300 6.1L V8
• 2012-2014 Chrysler 300 6.4L V8 (2015-2021 International/Export SRT)
• Interchange Part Numbers: CUF504, UF-504, UF504, 7805-1355, 7805-8103, 2505-302202, 5C1569, 302202, C1526, E1004, 50090, 52-1828, GN10352, CLS1087, 56029129AA, 56029129AB, 56029129AF, 68060346AA

The Chrysler Muscle Standard

Designed for the heavy-hitting demands of modern American muscle, this ignition overhaul ensures your Hemi delivers uncompromised power, aggressive throttle response, and robust daily reliability.

Common Questions

What is included in this Chrysler 300 ignition kit?
This complete kit includes 8 high-output UF504-style ignition coil packs with thermal-resistant silicone boots and 16 iridium spark plugs—two plugs per cylinder as required by the Hemi V8 architecture.

Which Chrysler 300 V8 engines and years does this kit fit?
It fits 2005-2022 Chrysler 300 models equipped with the dual-plug UF504 coil-on-plug system, covering the 2006-2022 5.7L Hemi, 2005-2010 6.1L Hemi SRT8, and 2012-2014 6.4L Hemi SRT8 (plus 2015-2021 export 6.4L SRT models).

Does this kit fit a 2005 Chrysler 300 with the 5.7L Hemi?
This kit is built specifically for Hemi V8 models that use the UF504 direct coil-on-plug design (2005-2010 6.1L, 2006-2022 5.7L, and 2012-2021 6.4L). The 2005 5.7L V8 uses an earlier UF378 coil-and-wire setup.

Which factory part numbers do these ignition coils replace?
These coils are direct replacements for OEM part numbers 56029129AA, 56029129AB, 56029129AF, and 68060346AA, as well as aftermarket cross-references UF504, C1526, 5C1569, GN10352, and E1004.

Can this kit help with P0300 misfire codes and rough idle?
Yes. Replacing heat-soaked factory coils and worn spark plugs restores consistent voltage and a precise spark gap, which resolves P0300-series cylinder misfire codes, smooths out rough idling, and sharpens throttle response.