Cold Air Intake Kit For 2003-2007 Dodge RAM 2500 / 3500 5.9L L6 Diesel Engine

Confirmed exact fit for the make, model, year, and engine combination above. If your truck does not match the 5.9L Cummins L6 (e.g., 6.7L Cummins, 5.9L in a 1994–2002 second-gen Ram, or any Ford Powerstroke), this SKU is not the correct intake kit. Contact us with your VIN before ordering if you are unsure.

2003–2007 Dodge RAM 2500/3500 5.9L Cummins Cold Air Intake FAQs

Q1: Is this cold air intake legal in my state?

A1: No CARB Executive Order is on file for this SKU. Not legal for sale or use in California (and other CARB-adopting states). Diesel-exemption status must be verified directly with the manufacturer and with CARB before installation in any CARB-adopting jurisdiction. Outside CARB-adopting states, confirm your county and state emissions rules before ordering.

Q2: Will this fit my RAM 2500 or 3500?

A2: This kit is an exact fit for the 2003–2007 Dodge RAM 2500 and 3500 equipped with the 5.9L Cummins L6 diesel. It is not a fitment for the 6.7L Cummins (2007.5+), for the 5.9L Cummins in 1994–2002 second-generation trucks, or for any Ford Powerstroke application. If your truck does not match the year / engine combination above, contact us with your VIN before ordering.

Q3: How much horsepower will this add?

A3: Real-world gains on a mostly stock 5.9L Cummins are typically in the +5–15 whp range, depending on the truck, the tune, and supporting modifications. We do not publish a specific peak number for this SKU because we have not run a controlled product-level dyno test on it. For accurate numbers, see our dyno-verified test notes for the platform.

Q4: Will a cold air intake improve my MPG?

A4: MPG is dominated by driving habits, load, and tune. An intake alone cannot guarantee a measurable fuel-economy gain. Expect the main benefits to be a deeper intake tone, sharper throttle response, and less restrictive airflow — treat any MPG change as a possible bonus rather than the main reason to buy.

Q5: Will this void my warranty?

A5: Under the Magnuson-Moss Warranty Act, an aftermarket part cannot void your factory warranty unless the manufacturer proves the part caused the failure. This kit is a direct bolt-on replacement that retains the factory MAF and IAT sensors at the OEM location and bore, so it is installed as a like-for-like intake swap.

Q6: Will it throw a check engine light (CEL)?

A6: A properly installed kit that retains the factory MAF / IAT sensors at the OEM location and bore is designed to keep the MAF calibration within the OEM envelope. CELs after an intake install are most commonly caused by an intake leak, an over-oiled filter, or a disturbed sensor connection — our install checklist covers how to avoid each. See our CEL diagnostic Guide for the full flow.

Q7: Do I need a tune after installing?

A7: No tune is required for a bolt-on install that retains the factory MAF and IAT sensors at the OEM location. If you change the sensor bore, swap to a different intake tube diameter, or stack this kit with other intake modifications, a custom tune may be recommended to keep the MAF calibration in the optimal range.

Q8: Is this safe in rain or deep water?

A8: Normal rain driving is fine — the filter sits inside the heat-shielded enclosure. Avoid deep water crossings. The intake is low-mounted in the engine bay, and water ingestion past the filter can cause hydrolock and severe engine damage. If you regularly ford water on jobsites or off-road, consider a high-mounted air source or a relocation kit.

Q9: How do I clean and re-oil the filter?

A9: The dual-layer oiled cotton filter is washable and reusable. At each oil change (or sooner on dusty / jobsite / towing service), remove the filter, apply oiled-cotton filter cleaner, let it soak, rinse gently, then air-dry completely — no compressed air, no direct sunlight or heat. Once fully dry, apply filter oil evenly along each pleat, then re-install. Avoid over-oiling: excess oil can migrate onto the MAF sensor and trigger a CEL.

Q10: What does it sound like?

A10: You'll hear a deeper intake tone under acceleration, and most owners notice more turbo whistle at the same time. At cruise it quiets down. Sound is subjective — if you specifically want the loudest possible intake note, an open-element short-ram style would deliver more sound (at the cost of pulling warmer under-hood air).

Q11: What's included / what do I still need?

A11: The kit includes the heat-shielded enclosure, polished aluminum intake tube, dual-layer oiled cotton filter, silicone couplers, stainless T-bolt clamps, mounting brackets, hardware, and installation instructions. Your factory MAF and IAT sensors are transferred from the stock airbox (not included in the kit). You'll need basic hand tools, and for ongoing maintenance you'll want oiled-cotton filter cleaner and re-oil. Replacement oiled-cotton filters and service kits are available separately in our engine air filter collection.

Q12: Will it work with an aftermarket throttle body or upgraded turbo?

A12: This kit is engineered for the factory throttle body bore on the 5.9L Cummins. The 5.9 Cummins in 2003–2007 is naturally aspirated from the factory intake side (the turbocharger sits on the exhaust side and is not modified by this kit). If you run an aftermarket throttle body or any modification that changes the factory bore, verify the coupler and clamp size with our support team before ordering.

Q13: Does the heat shield actually matter on a 5.9 Cummins?

A13: Yes. Under-hood heat builds quickly on a turbo diesel, and an exposed filter near the engine block pulls warm air instead of cooler outside air. The sealed heat-shielded enclosure on this kit separates the filter from that heat and supports more consistent inlet temperatures — one of the details that lets the kit function as a true cold-air setup rather than just an exposed filter in a hot engine bay.