aFe Momentum GT Cold Air Intake

Dodge Durango 18-24 6.4L 392, Jeep Grand Cherokee 12-21 6.4L

Part #: 51-76206-1

Overview

The aFe Momentum GT Cold Air Intake is engineered to enhance the performance of your Jeep Grand Cherokee 6.4L SRT8, model years 2012 through 2021. Designed for enthusiasts seeking improved horsepower, throttle response, and airflow efficiency, this intake system replaces the restrictive factory air intake with a precision-engineered solution. Whether you drive on the street or track, the Momentum GT delivers a noticeable boost in engine breathing, helping your SRT8 perform at its best.

With a focus on durability and ease of maintenance, this intake system offers a seamless upgrade that complements the aggressive styling of your Jeep while providing functional benefits that last.

Key Features

The Momentum GT Cold Air Intake combines advanced engineering with high-quality materials to deliver superior performance and reliability. Key features include:

• Custom roto-molded intake tube designed using CAD and dyno-tuned for maximum airflow and factory-quality fitment
• One-piece housing made from durable cross-linked polyethylene (XLPE) with excellent heat resistance
• Integrated clear sight window for quick inspection of the air filter without disassembly
• Precision-molded air temperature sensor fitting for plug-and-play compatibility with OEM sensors
• Reinforced silicone hump couplings and stainless steel T-bolt clamps for secure, leak-free connections
• Engineered with fewer components for a straightforward installation using factory mounting points

Filter Options

The Momentum GT Cold Air Intake is available with two high-performance filter options to suit different preferences and maintenance routines:

• Pro 5R (Oiled): A 5-layer cotton gauze filter media that progressively filters air for maximum performance and airflow. It is washable, reusable, and ideal for both street and track use.
• Pro DRY S (Non-Oiled): A 3-layer synthetic media filter that requires no oil, offering easy maintenance while maintaining excellent filtration and airflow. Perfect for daily drivers.

Construction & Design

The intake system’s housing is crafted from high-quality cross-linked polyethylene (XLPE), a material known for its outstanding heat resistance and durability. This roto-molded housing not only protects the air filter from engine heat but also optimizes airflow dynamics. The inclusion of a clear sight window allows for quick visual inspection of the filter’s condition without removing the intake cover, adding convenience to routine maintenance.

The intake tube is precision-engineered using computer-aided design and dyno testing to ensure it delivers maximum airflow while maintaining a perfect fit with factory components. The tube’s high-quality plastic construction includes a molded fitting for the air temperature sensor, ensuring seamless integration with your Jeep’s original equipment.

Performance & Sound

By improving the engine’s breathing capabilities, the Momentum GT Cold Air Intake enhances throttle response and increases horsepower potential. The system’s design promotes smoother airflow, which can contribute to a more aggressive engine sound that complements the Jeep Grand Cherokee SRT8’s performance character without being overly loud or intrusive.

Installation & Fitment

Installation is straightforward and designed to be completed using existing factory mounting points, requiring no cutting, drilling, or modifications. The system includes reinforced silicone couplings and stainless steel T-bolt clamps to ensure a secure, leak-free fit. This user-friendly design allows enthusiasts to upgrade their intake system quickly and confidently.

What's Included

• Roto-molded intake tube with integrated air temperature sensor fitting
• One-piece cross-linked polyethylene housing with clear sight window
• Choice of Pro 5R (oiled) or Pro DRY S (non-oiled) air filter
• Reinforced silicone hump couplings
• Stainless steel T-bolt clamps
• All necessary hardware for installation

Ideal For

The aFe Momentum GT Cold Air Intake is ideal for Jeep Grand Cherokee 6.4L SRT8 owners who want to unlock additional horsepower and improve throttle response without sacrificing reliability or ease of maintenance. It suits daily drivers seeking a performance upgrade as well as enthusiasts who occasionally take their vehicle to the track. The choice of filter options allows customization based on maintenance preferences and driving conditions.

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

12-25 Ram / Durango / Jeep Grand Cherokee 6.4L 392

E3.74

The E3.74 Automotive Spark Plug is the perfect upgrade for your vehicle. Designed with E3’s innovative DiamondFIRE technology, this plug creates a more complete and efficient burn, resulting in increased power, improved throttle response, reduced fuel consumption, and lower emissions. Built with a 14mm thread diameter, 1.000" reach, and taper seat, the E3.74 plug ensures a secure, OEM-style fit. Its unique three-legged ground electrode stabilizes the DiamondFIRE tip and provides exceptional heat transfer and combustion turbulence. The fixed gap means there's no need for adjustments, ensuring consistent spark and optimal engine performance. Backed by a 100,000-mile or 5-year performance guarantee, the E3.74 is a reliable, high-performance replacement for demanding HEMI engines.

• Patented DiamondFIRE Technology: Increases spark efficiency for better power, fuel economy, and cleaner emissions
• Three-Leg Ground Electrode Design: Secures the tip while promoting enhanced cylinder turbulence and faster heat transfer
• Fixed DiamondFIRE Gap: Pre-set spark gap ensures reliable ignition with no manual adjustment needed
• Built for Longevity: Delivers dependable performance for up to 100,000 miles or 5 years
• OEM-Compatible Specs: 14mm thread diameter, 1.000" reach, 5/8" hex size, taper seat
• Environmentally Friendly: Helps reduce hydrocarbon emissions and support cleaner engine operation