Performance Air Intake for GMC Envoy(2006-2009) 4.2L Engine - Blue

Optimize the Volumetric Efficiency of Your 2006-2009 GMC Envoy and the Atlas LL8 Engine

Who It’s For: Designed specifically for 2006-2009 GMC Envoy owners running the legendary 4.2L Atlas LL8 Vortec 4200 engine.

The Problem: The Atlas LL8 is one of the most over-engineered inline-six engines ever built, featuring dual overhead cams and variable valve timing. However, GMC choked this engine from the factory with a restrictive airbox and multiple plastic sound-baffling resonators. This stock setup creates significant air turbulence and heat soak, preventing the Vortec 4200 from reaching its true power potential in the mid-to-high RPM range.

The Solution: We engineered this performance intake to eliminate the factory bottlenecks. By replacing the baffled plastic tubing with a mandrel-bent T304 aluminum pipe, we provide a direct, high-velocity path for oxygen to reach the throttle body. This setup corrects the factory design flaws of the Atlas LL8, delivering reliable performance and a much-needed aggressive engine note.

Why This is the Ultimate Upgrade

• Consistent Power Delivery: Expect a noticeable increase in horsepower and torque (up to 10%) by reducing pumping losses and allowing the DOHC head to breathe freely.
• T304 Aluminum Construction: Unlike cheap plastic intakes that can warp or crack, our lightweight T304 aluminum piping handles under-hood temperatures with ease and features a Blue powder-coated finish for a custom engine bay look.
• High-Flow Washable Filtration: The included micro-cotton gauze filter provides superior filtration while increasing surface area. It’s washable and reusable, meaning you won’t be buying paper filters every 15,000 miles.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2006 GMC Envoy 4.2L L6
• 2007 GMC Envoy 4.2L L6
• 2008 GMC Envoy 4.2L L6
• 2009 GMC Envoy 4.2L L6

Interchange Reference:

2006, 2007, 2008, 2009, GMC, ENVOY, 4.2L, L6, LL8, VORTEC 4200, T304

The Performance Promise

Buy with confidence. As specialists in the Atlas engine platform, we know exactly what these I-6 motors need to perform. This kit includes everything needed for a bolt-on installation in under 60 minutes using standard hand tools. Pro Tip: Disconnect your battery during the install to allow the PCM to "re-learn" the new airflow parameters for the best results.