Performance Air Intake for Isuzu Ascender (2006-2008) 4.2L EngineMaximize Volumetric Efficiency for Your Isuzu Ascender 4. 2L Atlas LL8 Who Its For: Designed specifically for Isuzu Ascender owners running the GM Atlas LL8 inline six engine who want better throttle response and a more aggressive engine note without compromising reliability. The Problem: The Atlas LL8 is a remarkably smooth and over engineered engine, but the factory air box is a major bottleneck. The stock plastic piping is designed for silence,