Holley EFI Gen III Hemi Hi-Ram EFI Manifold

2005–2020 Chrysler 300, 2006–2020 Dodge Charger, 2008–2020 Dodge Challenger, 2011–2020 Ram 1500 / 2500 / 3500, 2009–2020 Dodge Durango, 2006–2020 Jeep Grand Cherokee, and More

300-650BK

Overview:

The Holley EFI Gen III Hemi Hi-Ram EFI Manifold is a high-performance intake solution designed specifically for Gen III Hemi engines ranging from 5.7L to over 7.2L displacement. Engineered to maximize airflow and fuel delivery, this manifold is ideal for enthusiasts and builders seeking to extract more power from naturally aspirated, forced induction, or nitrous-equipped setups. Its modular design allows compatibility with a wide range of EFI tops, making it an excellent foundation for custom induction systems.

Built to fit large intake port Gen III Hemi engines—including 2009 and newer 5.7L, 2005–2010 6.1L, and 2011 and newer 6.4L variants—this manifold delivers exceptional performance potential at high RPMs, typically between 7,500 and 8,500. Whether you’re upgrading a muscle car, truck, or off-road rig, the Holley Hi-Ram manifold combines race-inspired styling with functional engineering to enhance throttle response and horsepower.

Key Features:

This manifold offers a comprehensive set of features designed to optimize performance and ease of use:

• Modular base design accepts a variety of EFI tops for custom induction builds
• Large intake ports measuring 1.70” height by 1.88” width for improved airflow
• Cast aluminum construction with a natural satin or black finish for durability and style
• EFI fuel rails machined for -8AN O-ring fittings with large passages to support high fuel flow and reduce pressure pulsations
• Compatibility with Gen III Hemi and Bosch EV-1 style fuel injectors
• Positive Crankcase Ventilation (PCV) ports with adapter fittings for emissions and crankcase management
• Port for OE-style Manifold Absolute Pressure (MAP) sensor (1 or 2 bar)
• Cast-in pads for nitrous nozzle installation, supporting nitrous applications
• Billet oil fill cap with a low-profile, attractive design
• Overall manifold height of 11.59” suitable for applications without height restrictions

Construction & Design:

The Holley Hi-Ram intake manifold is crafted from high-quality cast aluminum, providing a lightweight yet robust structure that withstands the rigors of high-performance use. Its runner length and tapered cross-section are carefully engineered to optimize airflow velocity and distribution across a broad range of engine configurations. The large retained O-ring seals ensure superior OE-style sealing against the cylinder heads, simplifying maintenance and enhancing reliability.

The manifold’s modular base design appeals to fabricators and builders who want to tailor their induction system, allowing for easy integration with various EFI tops or custom setups. The satin or black finish options offer both corrosion resistance and a race-inspired aesthetic that complements aggressive engine bays.

Performance & Sound

Designed to unlock the full potential of Gen III Hemi engines, the Hi-Ram manifold excels at delivering maximum power in the upper RPM range, making it ideal for drag racing, muscle cars, and high-performance street applications. Its large intake ports and efficient runner design improve volumetric efficiency, resulting in stronger throttle response and increased horsepower. Whether naturally aspirated or boosted, this manifold supports aggressive tuning and delivers a commanding induction sound that matches its bold styling.

Installation & Fitment:

The Holley Hi-Ram manifold is a direct fit for 2009–2020 Ram 1500, 2500, and 3500 models, 2005–2020 Chrysler 300, 2006–2020 Dodge Charger, 2008–2020 Dodge Challenger, 2009–2020 Dodge Durango, 2006–2020 Jeep Grand Cherokee, and related SRT and Magnum variants within these year ranges. Installation requires standard intake manifold procedures and is best performed by experienced technicians or knowledgeable enthusiasts. Due to its height and design, it is intended for applications where induction system height is not restricted.

What's Included:

• Cast aluminum Hi-Ram intake manifold base
• EFI fuel rails with -8AN O-ring fittings
• Billet oil fill cap
• Adapter fittings for PCV ports
• O-ring seals for cylinder head mounting

Ideal For:

This manifold is perfect for performance enthusiasts, racers, and custom builders who demand maximum airflow and fuel delivery for Gen III Hemi engines. It suits naturally aspirated setups, forced induction builds, and nitrous applications alike. Whether upgrading a muscle car, street rod, marine engine, off-road vehicle, or pulling truck, the Holley Hi-Ram manifold provides a versatile and powerful foundation for serious power gains.

Holley EFI delivers standalone engine management and EFI systems built for everything from engine swaps to serious horsepower builds. With platforms like Sniper, Terminator X, HP, and Dominator, Holley EFI is aimed at enthusiasts who want modern tuning control, data, and drivability—whether it’s a street car, track car, or full-on race program.