Glacier Diesel Power 2007.5–2024 Ram 6.7L Cummins Mega-Flo S-3 Intake Manifold (07511-MFS3)
Description
The factory 6.7L Cummins intake manifold was designed to meet production and emissions requirements—not to maximize airflow for towing, racing, or high-performance applications.
The Glacier Diesel Power Mega-Flo S-3 Intake Manifold was engineered to eliminate many of the airflow restrictions found in the factory intake while providing one of the highest-flowing intake manifolds available for the 6.7L Cummins. Featuring a precision permanent mold aluminum casting, a high-flow 5-bolt mounting design, integrated accessory ports, and a clean, streamlined intake path, the S-3 is designed to support increased airflow while giving your engine room to grow as your performance goals evolve.
Unlike the S-2, the Mega-Flo S-3 features a smooth, non-flanged inlet design for customers who do not need compatibility with Glacier Diesel Power's TVM or TVH Arctic Grid Heaters. If maximum airflow and a clean intake path are your priorities, the S-3 delivers exactly that.
This isn't a newly released product that's still proving itself. The Mega-Flo S-3 has been one of Glacier Diesel Power's flagship intake manifolds for years and has earned its reputation on everything from stock daily drivers and dedicated tow rigs to some of the highest-horsepower Cummins builds in the country, including trucks producing well over 3,000 horsepower.
Every manifold is proudly designed, cast, precision machined, and assembled in the USA using premium materials and manufacturing processes to deliver exceptional strength, reliability, and long-term performance.
Features
- Designed and manufactured by Glacier Diesel Power
- Part Number: 07511-MFS3
- Fits 2007.5–2024 Ram 2500 & 3500 6.7L Cummins Pickup Trucks
- Precision permanent mold aluminum casting
- Heat-treated for superior strength
- High-flow 5-bolt intake design
- Precision-machined gasket retention boss to help prevent gasket movement
- Five integrated 1/8" NPT accessory ports
- Smooth, non-flanged inlet design for maximum airflow
- Available raw or powder coated
- Proven on trucks producing over 3,000 horsepower
- Proudly Made in the USA
Why Upgrade Your Intake Manifold?
As horsepower and airflow demands increase, the factory intake manifold can become a restriction. Whether you're towing heavy loads, upgrading your turbocharger, increasing fueling, or building a competition truck, unrestricted airflow becomes increasingly important.
The Mega-Flo S-3 was engineered to provide:
- Increased airflow
- Reduced intake restriction
- Improved throttle response
- Lower exhaust gas temperatures (EGTs)
- Better turbocharger efficiency
- Support for larger turbochargers
- Room for future performance upgrades
Its unique 5-bolt design eliminates the large center obstruction found in the factory six-bolt configuration, allowing for a substantially larger inlet opening while maintaining excellent gasket retention and sealing.
Glacier Tech Tip
The Mega-Flo S-3 is designed for customers who want maximum airflow without the flanged mounting surface used for Glacier Diesel Power's TVM and TVH Arctic Grid Heaters.
If you plan to install one of our Arctic Grid Heater Systems, the Mega-Flo S-2 is the correct intake manifold. If your goal is the cleanest, highest-flowing intake path possible without a heater flange, the Mega-Flo S-3 is the ideal choice.
The S-3 is also one of the key components used in our legendary Mega Rail Conversion System for 2003–2007 5.9L Common Rail Cummins engines. By combining the S-3 with the larger 6.7L fuel rail, larger injector lines, and supporting components, the Mega Rail system dramatically increases airflow and fuel system capacity for serious performance applications.
If you're considering a 5.9L Mega Rail Conversion, give our team a call before ordering. We'll help you build a complete conversion package with the correct fuel rail, injector lines, fittings, intake components, and everything else needed for your specific horsepower goals.
Why Choose Glacier Diesel Power?
The Mega-Flo S-3 wasn't built simply to replace the factory intake manifold—it was engineered to become the foundation of a better-performing intake system.
Using a permanent mold casting process creates a stronger, denser casting with improved dimensional consistency compared to conventional sand castings. Every manifold is then heat treated and precision machined before final assembly to ensure exceptional fit, sealing performance, and long-term durability.
From work trucks and tow rigs to some of the highest-horsepower Cummins builds in the country, the Mega-Flo S-3 has earned its reputation by delivering dependable performance where it matters most. When you're building a truck with four-digit horsepower—or even pushing beyond 3,000 horsepower—you need components you can trust. That's exactly why the S-3 continues to be a proven choice for serious diesel enthusiasts.
Applications
Fits:
- 2007.5–2012 Ram 2500 & 3500 6.7L Cummins Pickup Trucks
- 2013–2024 Ram 2500 & 3500 6.7L Cummins Pickup Trucks
Also commonly used on 2003–2007 Dodge Ram 5.9L Cummins Mega Rail Conversions. Contact our team if you're interested in building a complete Mega Rail Conversion package.
Kit Contents
Includes:
- Glacier Diesel Power Mega-Flo S-3 Intake Manifold
- Intake manifold gaskets
- Mounting hardware
- Pipe plugs
- Installation instructions
Important Notes
- Fits 2007.5–2024 Ram 2500 & 3500 6.7L Cummins Pickup Trucks.
- Also commonly used on 2003–2007 Dodge Ram 5.9L Cummins Mega Rail Conversions.
- 2019–2024 applications require a slight modification (careful bending) of the factory high-pressure fuel line to provide proper clearance for the intake manifold.
- Many customers and professional installation shops have successfully performed this modification without affecting fuel system performance or reliability.
- If you are not comfortable making this modification, or having a qualified installer perform it, please do not purchase this intake manifold.
- Returns requested because of the required 2019–2024 fuel line modification will be subject to a 30% restocking fee, as this installation requirement is clearly disclosed prior to purchase.
- Compatible with Fleece Performance and ATS Twin CP3 systems.
- Not compatible with factory twin alternator applications.
- Not legal for sale or use in California where prohibited.
- Proudly designed and manufactured in the USA.
Factory Intake Manifold Limitations
The factory intake manifold was designed around packaging constraints and OEM production requirements. As airflow demand increases from larger turbochargers, increased fueling, heavy towing, or competition use, the factory intake can become a restriction.
The Glacier Diesel Power Mega-Flo S-3 addresses those limitations with a larger high-flow inlet, improved mounting design, and a streamlined intake path. Whether your goal is a dependable daily driver, a dedicated tow rig, or a competition truck producing thousands of horsepower, the S-3 provides the airflow, strength, and versatility needed to support your build.
Complete Your Intake System
Complete your intake package with:
- Glacier Diesel Power Air-Boss Intake Plenum
- Glacier Diesel Power Billet Throttle Valve Delete
- Glacier Diesel Power Billet Dipstick Bracket
- Glacier Diesel Power Boost Bolt
- MAP Sensor & O-Ring
- Intake Manifold Gasket
- Glacier Diesel Power Silicone Boots
Glacier Diesel Power 2007.5–2024 Ram 6.7L Cummins Mega-Flo S-3 Intake Manifold (07511-MFS3)
Description
The factory 6.7L Cummins intake manifold was designed to meet production and emissions requirements—not to maximize airflow for towing, racing, or high-performance applications.
The Glacier Diesel Power Mega-Flo S-3 Intake Manifold was engineered to eliminate many of the airflow restrictions found in the factory intake while providing one of the highest-flowing intake manifolds available for the 6.7L Cummins. Featuring a precision permanent mold aluminum casting, a high-flow 5-bolt mounting design, integrated accessory ports, and a clean, streamlined intake path, the S-3 is designed to support increased airflow while giving your engine room to grow as your performance goals evolve.
Unlike the S-2, the Mega-Flo S-3 features a smooth, non-flanged inlet design for customers who do not need compatibility with Glacier Diesel Power's TVM or TVH Arctic Grid Heaters. If maximum airflow and a clean intake path are your priorities, the S-3 delivers exactly that.
This isn't a newly released product that's still proving itself. The Mega-Flo S-3 has been one of Glacier Diesel Power's flagship intake manifolds for years and has earned its reputation on everything from stock daily drivers and dedicated tow rigs to some of the highest-horsepower Cummins builds in the country, including trucks producing well over 3,000 horsepower.
Every manifold is proudly designed, cast, precision machined, and assembled in the USA using premium materials and manufacturing processes to deliver exceptional strength, reliability, and long-term performance.
Features
- Designed and manufactured by Glacier Diesel Power
- Part Number: 07511-MFS3
- Fits 2007.5–2024 Ram 2500 & 3500 6.7L Cummins Pickup Trucks
- Precision permanent mold aluminum casting
- Heat-treated for superior strength
- High-flow 5-bolt intake design
- Precision-machined gasket retention boss to help prevent gasket movement
- Five integrated 1/8" NPT accessory ports
- Smooth, non-flanged inlet design for maximum airflow
- Available raw or powder coated
- Proven on trucks producing over 3,000 horsepower
- Proudly Made in the USA
Why Upgrade Your Intake Manifold?
As horsepower and airflow demands increase, the factory intake manifold can become a restriction. Whether you're towing heavy loads, upgrading your turbocharger, increasing fueling, or building a competition truck, unrestricted airflow becomes increasingly important.
The Mega-Flo S-3 was engineered to provide:
- Increased airflow
- Reduced intake restriction
- Improved throttle response
- Lower exhaust gas temperatures (EGTs)
- Better turbocharger efficiency
- Support for larger turbochargers
- Room for future performance upgrades
Its unique 5-bolt design eliminates the large center obstruction found in the factory six-bolt configuration, allowing for a substantially larger inlet opening while maintaining excellent gasket retention and sealing.
Glacier Tech Tip
The Mega-Flo S-3 is designed for customers who want maximum airflow without the flanged mounting surface used for Glacier Diesel Power's TVM and TVH Arctic Grid Heaters.
If you plan to install one of our Arctic Grid Heater Systems, the Mega-Flo S-2 is the correct intake manifold. If your goal is the cleanest, highest-flowing intake path possible without a heater flange, the Mega-Flo S-3 is the ideal choice.
The S-3 is also one of the key components used in our legendary Mega Rail Conversion System for 2003–2007 5.9L Common Rail Cummins engines. By combining the S-3 with the larger 6.7L fuel rail, larger injector lines, and supporting components, the Mega Rail system dramatically increases airflow and fuel system capacity for serious performance applications.
If you're considering a 5.9L Mega Rail Conversion, give our team a call before ordering. We'll help you build a complete conversion package with the correct fuel rail, injector lines, fittings, intake components, and everything else needed for your specific horsepower goals.
Why Choose Glacier Diesel Power?
The Mega-Flo S-3 wasn't built simply to replace the factory intake manifold—it was engineered to become the foundation of a better-performing intake system.
Using a permanent mold casting process creates a stronger, denser casting with improved dimensional consistency compared to conventional sand castings. Every manifold is then heat treated and precision machined before final assembly to ensure exceptional fit, sealing performance, and long-term durability.
From work trucks and tow rigs to some of the highest-horsepower Cummins builds in the country, the Mega-Flo S-3 has earned its reputation by delivering dependable performance where it matters most. When you're building a truck with four-digit horsepower—or even pushing beyond 3,000 horsepower—you need components you can trust. That's exactly why the S-3 continues to be a proven choice for serious diesel enthusiasts.
Applications
Fits:
- 2007.5–2012 Ram 2500 & 3500 6.7L Cummins Pickup Trucks
- 2013–2024 Ram 2500 & 3500 6.7L Cummins Pickup Trucks
Also commonly used on 2003–2007 Dodge Ram 5.9L Cummins Mega Rail Conversions. Contact our team if you're interested in building a complete Mega Rail Conversion package.
Kit Contents
Includes:
- Glacier Diesel Power Mega-Flo S-3 Intake Manifold
- Intake manifold gaskets
- Mounting hardware
- Pipe plugs
- Installation instructions
Important Notes
- Fits 2007.5–2024 Ram 2500 & 3500 6.7L Cummins Pickup Trucks.
- Also commonly used on 2003–2007 Dodge Ram 5.9L Cummins Mega Rail Conversions.
- 2019–2024 applications require a slight modification (careful bending) of the factory high-pressure fuel line to provide proper clearance for the intake manifold.
- Many customers and professional installation shops have successfully performed this modification without affecting fuel system performance or reliability.
- If you are not comfortable making this modification, or having a qualified installer perform it, please do not purchase this intake manifold.
- Returns requested because of the required 2019–2024 fuel line modification will be subject to a 30% restocking fee, as this installation requirement is clearly disclosed prior to purchase.
- Compatible with Fleece Performance and ATS Twin CP3 systems.
- Not compatible with factory twin alternator applications.
- Not legal for sale or use in California where prohibited.
- Proudly designed and manufactured in the USA.
Factory Intake Manifold Limitations
The factory intake manifold was designed around packaging constraints and OEM production requirements. As airflow demand increases from larger turbochargers, increased fueling, heavy towing, or competition use, the factory intake can become a restriction.
The Glacier Diesel Power Mega-Flo S-3 addresses those limitations with a larger high-flow inlet, improved mounting design, and a streamlined intake path. Whether your goal is a dependable daily driver, a dedicated tow rig, or a competition truck producing thousands of horsepower, the S-3 provides the airflow, strength, and versatility needed to support your build.
Complete Your Intake System
Complete your intake package with:
- Glacier Diesel Power Air-Boss Intake Plenum
- Glacier Diesel Power Billet Throttle Valve Delete
- Glacier Diesel Power Billet Dipstick Bracket
- Glacier Diesel Power Boost Bolt
- MAP Sensor & O-Ring
- Intake Manifold Gasket
- Glacier Diesel Power Silicone Boots