Cold Air Intake for Nissan Altima (2002-2006) 2.5L EngineBoost Throttle Response & Intake Velocity for your Nissan Altima QR25DE Who Its For: Designed specifically for 20022006 Nissan Altima owners running the QR25DE engine family. The Problem: The QR25DE is a torquey four cylinder, but the factory air box is choked by a series of baffles and resonators designed solely to keep the car quiet. This creates a massive restriction in the intake tract, leading to sluggish throttle response and heat soak during