Is It Time to Upgrade Your 6.7L Cummins Intake Manifold?AutoGuide.comAutoGuide.com Sponsored ContentFri, September 11, 2026 at 5:23 PM UTCAdd us on Googleis it time to upgrade your 6 7l cummins intake manifoldThere are few engines in the diesel world that are as well-known as the Cummins, especially the current form of the 6.7L Cummins found in 2007 to current Ram ¾ and one-ton trucks. These engines are already quite powerful, but for those of us whose Ram will spend most of its time off-road, swapping in a new intake manifold can produce a serious horsepower increase.Upgrading Your 6.7 Cummins Intake ManifoldStock factory intake manifolds are built to meet emissions requirements first and foremost. Air flow efficiency is nowhere near the main concern. The stock manifold is restricted with tight-radius bends in the tubing, and an air-flow path that creates serious turbulence before the air ever reaches the cylinders. Your turbo has to work harder to move the same amount of air, intake temps can climb under load, and you are not going to come even close to the potential horsepower your Cummins can produce.The factory grid heater bolt threads directly through the intake tract. When it eventually fails due to fatigue, it can break off and then drop straight into the engine. This is a serious thing that can happen. For your off-road Ram, there is an option.Enter The GLOWOLF Manifoldis it time to upgrade your 6 7l cummins intake manifoldGLOWOLF specializes in competition-ready diesel horsepower. With its High-Flow Intake Manifold kit for the 6.7L Cummins, it completely redesigned the internal flow path. Intended for competition use only, the GLOWOLF manifold is larger and smoother, with optimized bell-mouth entries designed to reduce turbulence and improve airflow.AdvertisementAdvertisementWhen you're driving at normal cruising speeds, where lower pressure differentials exist, the GLOWOLF manifold has a roughly 4% increase in airflow over the stock setup. Under higher pressure differentials, such as when you're towing, accelerating hard, and the motor is under high boost, that difference grows to as much as 6.7%, with a similar increase in horsepower.During testing, under CFD simulations at 1.8 bar of boost, the GLOWOLF manifold showed up to 12.76% more mass airflow than the industry-leading alternative at 3,000 RPM. GLOWOLF then tested the results with real-world bench testing using an industrial centrifugal fan, controlled pressure differentials, and precision sensors recording flow rates at 200 samples per second.After that, it was time to hit the dirt and see what it did off the beaten path and wide open. Everything performed as expected. The extra airflow matters quite a bit when you put the engine under load. With the GLOWOLF manifold kit, the turbo doesn't have to work as hard to move the air, EGTs are easier to manage, and your truck breathes the way it should have from the factory.Airflow Is Half The Storyis it time to upgrade your 6 7l cummins intake manifoldThe included heater plate completely eliminates the factory grid heater bolt. It removes that failure point at the source. The GLOWOLF kit includes two heating coils mounted on the intercooler side, so even in the unlikely event of a failure, the engine stays protected.AdvertisementAdvertisementThe GLOWOLF High-Flow 6.7 Cummins intake manifold also includes a full-power wiring harness, all the gaskets, and mounting hardware. It is not just a performance modification, but an added reliability one, too. That's seriously important when you're off-road and far away from a shop or even a tow truck. It even comes in 4 different color options to match your motor and your style. Get one for your 2007.5 to 2026 Ram 2500 or 3500 truck.NOTE: This is sponsored content produced in partnership with GLOWOLF