Weapon R Secret Weapon Short Ram Air Intake 1990-97 Nissan Pickup / 1998-04 Frontier / Xterra 4 Cylinder OnlyThe Secret Weapon Intake was designed, to increase air intake volume to the 1990 97 Nissan Pickup 1998 04 Frontier Xterra 4 Cylinder engine. The concept is to create two different air velocity profiles, one traveling at higher speeds than the other. This technology increases air volume and speed to the engine, which naturally feeds the engine 3x more air than the conventional air intake system. The intake pipe is bent out of high quality 6061 Aluminum