The K&N 77-1533KP is a cold air induction kit built around a mandrel-bent aluminum intake tube and a washable, oiled cotton gauze high-flow filter, sized for the 5.7L Hemi V8 in 2003-2008 Dodge Ram 1500, 2500, and 3500 trucks. The manufacturer estimates a gain of 8.34 HP at 5,391 RPM and 8.1 lb-ft of torque. Those are estimates, not guaranteed dyno results. Owners on user forums often describe the stock-truck gain as modest, with the clearest change in throttle response and intake sound, so this kit makes the most sense as a first step in a broader build. Compared with a basic drop-in filter, the aluminum tube and reusable filter give a more complete airflow upgrade. Searches for 2003-2008 Ram 5.7 Hemi CAI, polished aluminum 77 Series intake, and washable cotton gauze filter 5.7 Hemi kit lead to this part.
The manufacturer lists this kit for 2003-2008 Dodge Ram 1500, 2500, and 3500 trucks equipped with the 5.7L V8 engine.
The manufacturer describes the high-flow filter as washable and reusable. Confirm the cleaning method against the manufacturer's care instructions before servicing it.
Emissions status could not be confirmed with the manufacturer during research, and details vary between sources. Check your state's emissions requirements before purchasing.
Owners on user forums describe this as a straightforward bolt-on, and one owner reported completing the swap in about 10 to 15 minutes. Other owners on user forums say the install is fiddly and that fit and finish can vary, so allow extra time, check the clamp and coupler alignment before final tightening, and confirm the hardware and steps with the manufacturer's instructions. Specific tool requirements were not confirmed during research.
