The K&N 71-1557 is a Blackhawk Induction cold air intake built for the 6.7L Cummins turbo diesel in 2007-2009 Dodge Ram 2500 and 3500 trucks. It pairs a black powder-coated aluminum tube with a layered synthetic filter, and it includes a steel heat shield that helps protect intake air from the high temperatures of your engine bay. Like the stock setup, it replaces factory air filter and intake tube.
Against stock, the manufacturer's dyno testing estimates 9.2 horsepower at 2950rpm and 19.1 pound-feet of torque at 2250rpm to the wheels, and K&N guarantees an increase in horsepower and torque. The filter is oil-free, which matters because owners on user forums warn that an over-oiled filter can coat the intake. Owners also report dust getting past K&N filters, so inspect the intake tube periodically. The manufacturer calls for cleaning only every 50,000 miles under normal highway driving conditions.
Installation is rated by the manufacturer at 90 minutes or less with simple hand tools. Buyers searching for a 6.7 Cummins cold air intake install should plan on disconnecting the battery, moving the mass air sensor into the K&N tube, and reconnecting the crankcase vent hose. The manufacturer warns that skipping steps or leaving out the supplied hardware can damage the intake tube, throttle body, or engine.
The manufacturer's listings confirm 2007 fitment for the Ram 2500 and list the Ram 3500 for 2008-2009. Check your VIN and confirm 2007 Ram 3500 compatibility with the manufacturer before ordering.
No. The manufacturer describes this as an oil-free dry synthetic filter that does not require oil.
Details vary. Owners on user forums report that dealers were noncommittal when asked, and one thread mentions a claim that Dodge warned against K&N filters. Confirm your coverage with the manufacturer and your dealer before installing.
Per the manufacturer's install sheet for this kit, you will need a ratchet and extension, 9/16" and 10mm sockets, a 3/4" wrench, a 13mm wrench, a 10mm wrench, a T20 Torx bit, 2.5mm and 5mm hex keys, and pliers. Disconnect the negative battery cable first, and note that this can erase radio presets; some radios also need an anti-theft code afterward. Use all of the provided hardware, since the manufacturer warns that skipping it can damage the intake tube, throttle body, or engine. Reattach the crankcase vent hose and mount the heat shield bracket, and the manufacturer notes that the kit fits factory-style mounting points.
