The K&N 57-1533 is a 57 Series FIPK cold-air intake for the 5.7L HEMI V8 in Dodge Ram 1500 and 2500 trucks. The manufacturer lists 2003-2008 for these models. It replaces the factory airbox with a rotationally molded, high-density polyethylene tube, a large washable cotton-gauze filter, and a heat shield. For buyers chasing 5.7 Hemi throttle response, this is a complete intake rather than a drop-in filter.
The manufacturer's estimated gain is 10.48 HP at 5445 RPM and 10.1 lb-ft of torque, and the kit carries CARB EO number D-269-37, so it is street legal in all 50 states. Owners on user forums are more cautious. Many report gains closer to 5 HP, and they say the most benefit comes when the intake pairs with a freer-flowing exhaust or a tune. Expect a modest bolt-on result and a stronger intake note, not a dramatic power jump.
Installation uses the factory mounting points, and the manufacturer's install sheet calls for an 8mm deep socket, 10mm, 13mm, and 7/16" sockets, a 7/16" wrench, a flat-blade screwdriver, and a ratchet with a 6" extension. Disconnect the negative battery before starting, since that erases radio presets. The manufacturer recommends keeping the factory intake, and it notes the kit does not fit trucks with a body lift. Keywords: 5.7 Hemi cold air intake, Ram 1500 2003-2008 CAI, 57-1533 install, CARB EO D-269-37, Hemi intake throttle response.
The manufacturer's listing for this intake covers 2003-2008 Dodge Ram 1500 and 2500 trucks with the 5.7L HEMI. The product title references 03-07, so confirm your truck's year and VIN with the manufacturer before ordering.
Yes. The manufacturer's install sheet recommends that customers do not discard the factory air intake.
The manufacturer states the kit is CARB exempt under EO number D-269-37 and street legal in all 50 states.
The manufacturer lists replacement filter RE-1040 for this intake, which is useful when cleaning or replacing the filter later.
The manufacturer's install sheet describes a bolt-on job that uses the existing factory mounting points. Gather the listed tools first, then disconnect the negative battery and note your radio presets, since the battery disconnect erases them. Remove the intake tube, lift the airbox off its studs, disconnect the air temperature sensor, and loosen the resonator box. Transfer the air temperature sensor into the new tube, and use only the provided hardware, because the manufacturer warns that skipping it can damage the intake tube, throttle body, or engine. Do not install on a body-lifted truck.
