aFe Cold Air Intake

Chrysler 300 / Dodge Challenger / Charger 11-23 6.4L 392

Part #: 51-12172

Overview

The aFe Cold Air Intake Stage-2 system is a direct bolt-on upgrade designed specifically for the 2011 and 2012 Chrysler 300C, Dodge Challenger, and Dodge Charger equipped with the 6.4L 392 HEMI engine. Engineered to unlock your vehicle’s true performance potential, this intake system significantly improves airflow, horsepower, and torque without compromising reliability or daily drivability. Whether you’re a performance enthusiast seeking enhanced throttle response or a daily driver looking for a smooth power boost, the aFe Stage-2 Cold Air Intake offers a balanced solution that elevates your driving experience.

With a focus on quality, durability, and ease of installation, this system replaces the restrictive factory intake with a high-flow design that delivers cooler, denser air to your engine. The result is improved volumetric efficiency, increased power output, and a more aggressive engine sound that complements the muscular character of your 6.4L HEMI.

Key Features

The aFe Stage-2 Cold Air Intake system incorporates advanced engineering and premium materials to maximize performance and longevity. Key features include:

• Up to 12% increased airflow compared to the factory intake for enhanced engine breathing
• Potential gains of up to 18 horsepower and 22 lb-ft of torque for noticeable performance improvements
• Heat-insulating roto-molded intake tube designed to reduce heat soak and improve volumetric efficiency
• Durable, powder-coated 18-gauge steel heat shield to protect the intake charge from engine heat
• Heavy-duty stainless steel T-bolt clamps for secure, vibration-resistant installation
• Silicone throttle body adapter ensuring a leak-free seal and long-lasting connection
• Direct bolt-on design using all factory mounting points—no cutting or drilling required

Filter Options

The system offers two high-performance air filter options tailored to different driving needs:

• Pro 5R (Oiled): Features five layers of progressively finer cotton gauze for maximum airflow and filtration efficiency. This washable and reusable filter is ideal for both street and track use, delivering long-term performance with easy maintenance.
• Pro DRY S (Dry): Constructed from three layers of oil-free synthetic media, this filter provides 99.2% filtration efficiency without the need for oiling. Perfect for street and light off-road applications, it offers hassle-free upkeep and dependable protection.

Construction & Design

The aFe Stage-2 Cold Air Intake is built with premium materials and precision engineering to ensure durability and optimal performance. The intake tube is roto-molded from heat-insulating plastic, which resists heat soak and maintains cooler air temperatures for improved combustion. The one-piece heat shield is crafted from heavy-duty 18-gauge steel and finished with a powder-coated surface to withstand harsh engine bay conditions while effectively blocking heat.

Both filter options are constructed from 100% polyurethane media designed for multiple cleaning cycles and years of dependable use. The entire assembly is engineered for a secure fit and long-lasting performance, making it a reliable upgrade for your 6.4L HEMI-powered vehicle.

Performance & Sound

By increasing airflow and reducing intake restrictions, the aFe Cold Air Intake system enhances throttle response and engine efficiency. Drivers can expect up to 18 additional horsepower and 22 lb-ft of torque, translating to stronger acceleration and improved overall performance. The intake also produces a more aggressive and sporty induction sound, adding an engaging auditory element to your driving experience without being intrusive.

Installation & Fitment

The aFe Stage-2 Cold Air Intake is designed for a straightforward installation process that requires no cutting, drilling, or modifications. It utilizes all existing factory mounting points to ensure a secure and precise fit on 2011–2012 Chrysler 300C, Dodge Challenger, and Dodge Charger models equipped with the 6.4L 392 HEMI engine. Installation can typically be completed with basic hand tools, making it accessible for enthusiasts and professional installers alike.

What's Included

• Roto-molded plastic intake tube
• Powder-coated 18-gauge steel heat shield
• Choice of Pro 5R (oiled) or Pro DRY S (dry) air filter
• Silicone throttle body adapter
• Heavy-duty stainless steel T-bolt clamps
• All necessary mounting hardware and instructions

Ideal For

This cold air intake system is perfect for performance enthusiasts seeking a reliable and effective upgrade to boost power and throttle response on their 6.4L HEMI Chrysler 300, Dodge Challenger, or Dodge Charger. It also suits daily drivers who want improved engine efficiency and a more aggressive induction sound without sacrificing drivability or requiring complex installation.

Ripp HEMI High Performance Coil Packs

05-25 5.7L, 6.1L, 6.2L, & 6.4L  HEMI Engines

MV8-CPK (8 Coilpacks)

Our coil pack is engineered from the ground up with higher quality materials, and increased amount of windings (turn ratio) in the primary and secondary winding. This provides a boost in millijoule power output, and this results in an increase in spark energy. With a stronger spark, cylinder flame speed is increased and thus adding up to an additional 20hp on the 5.7L and 25-30whp on the 6.4L. With this increased power output, you can expect a more responsive throttle input and a better driving experience overall. (For more technical information please see the tech notes below.)

Don't forget a fresh set of spark plugs. We recommend NGK Spark Plugs.

• Each order Includes all 8 coilpacks
• Direct bolt-on installation, plug and play
• Highest quality internal components and finish
• MOPAR Orange, Purple, Green or Steel Gray high temperature heat resistant outer housing 
• Heat resistant silicone boot
• Compatible with Naturally Aspirated and Forced Induction engines
• Improved Throttle Response
• Improved POWER
• Improved MPG
• No Tuning Required!!
• Heavy duty primary copper core winding.
• Higher quality Iron core with stronger laminations.
• Increased amount of secondary core windings.
• Precision Spool to promote Orthocycling winding and mitigate wild winding.  
• Sustained power delivery even at high RPM operation
• High Density Polymer Housing. 
• Heavy Duty, high-temperature, epoxy filled housing resists shock and vibration. Our dielectric compound completely penetrates coil windings assuring perfect insulation even upon exposure to high voltage conditions. Engineered to resist humidity, wear, vibration, impact and chemicals such as gasoline, oils and brake fluids. Will not degrade or crack even under severe thermal cycling.

*Not compatible with older generation 2003-2005 "gen III" engines.*   Please double check the year make and model of your vehicle and engine type. 

Fits the following vehicles:

• 2005 - Current: Dodge Charger/ Challenger V8
• 2005 - Current: Chrysler 300 V8
• 2007 - Current: RAM 1500 V8 (note: early 2007 vehicles might have have a gen III engine)
• 2007 - Current: Jeep Grand Cherokee V8 (note: early 2007 vehicles might have have a gen III engine) 5.7, SRT 
• 2007 - Current: Dodge Durango V8 (note: early 2007 vehicles might have have a gen III engine) 5.7, SRT
• 2021 - Current: Jeep Wrangler rubicon w/ 392 engine (V8)
• All Scat Pack, 392, SRT and Hellcat models.
• And many more V8 Hemi vehicles. 

TECH NOTES

RIPP Technical information about cylinder flame speed and how an upgraded ignition system will directly effect power. 

An Internal combustion engine's "flame speed" refers to the rate at which the air-fuel mixture burns during the combustion process. This speed significantly impacts engine performance and efficiency. The faster flame speed will increase cylinder pressure. When a spark is hotter, it ignites the air-fuel mixture more rapidly, leading to faster combustion, and an increase in pressure. Higher cylinder pressure = more torque pushing down on the piston.

Flame front propagation speed: As the flame front propagates faster across the combustion chamber, the fuel burns more efficiently, releasing more energy. This, in turn, enhances the engine's power and responsiveness. Additionally, with a faster flame speed, the combustion process is completed sooner, reducing the chance of incomplete burn or unburned hydrocarbons being released into the exhaust gases. In summary, optimizing the flame speed by utilizing more spark energy can significantly improve engine performance. It enables the engine to operate more efficiently, delivering increased power output, improved fuel economy.

Spark Energy is measured in Millijoules (mj). A Factory coilpack will generate 35.8mj. This mj value is considered low for the cylinder displacement value, piston surface area and air/fuel mixture. A RIPP coilpack will generate 53.6mj. This 17.8mj increase over stock will dramatically increase pressure per square inch across the piston surface. At first start up you'll immediately notice a smoother operating engine, and a "calmer" exhaust tone. This is due to less waste or unburnt hydrocarbons and fuel. Engine response and engine horse power will increase throughout the RPM range. 

E3 Spark Plugs

11-24 Chrysler 300 /  Dodge Challenger / Charger 6.4L 392

E3.74

The E3.74 Automotive Spark Plug is a high-performance replacement plug designed for vehicle. Engineered with E3’s patented DiamondFIRE technology, the plug promotes a faster, more complete combustion cycle—boosting horsepower, increasing fuel efficiency, and reducing emissions over the long term. This spark plug features a 14mm thread diameter, 1.000" reach, and taper seat to ensure a precise fit for your vehicle engine. Its triple-legged ground electrode secures the DiamondFIRE tip, enhancing heat dissipation and generating greater turbulence in the combustion chamber for maximum efficiency. The fixed-gap design eliminates the need for adjustments and delivers consistent spark performance across thousands of miles. Backed by a 5-year or 100,000-mile warranty, the E3.74 offers durability and peak engine performance for drivers who demand more from their vehicle.

• Patented DiamondFIRE Technology: Optimizes combustion for better throttle response, horsepower, and fuel economy
• Three-Leg Ground Electrode: Stabilizes the electrode for enhanced heat transfer and increased combustion turbulence
• Fixed DiamondFIRE Spark Gap: Factory-set for consistent ignition and long-term reliability—no gapping required
• Extended Service Life: Built to perform for 100,000 miles or 5 years under typical driving conditions
• Precision Fit: 14mm thread diameter, 1.000" reach, 5/8" hex, taper seat design
• Lower Emissions: Reduces unburned hydrocarbons for cleaner, more efficient engine performance