Cold Air Intake for Chevrolet Trailblazer GMC Envoy (2006-2009) 4.2L Engine

Maximize Torque and Throttle Response for your Chevrolet Trailblazer & GMC Envoy Atlas LL8 4.2L

Who It’s For: Designed specifically for 2006-2009 Chevrolet Trailblazer and GMC Envoy owners running the GM Atlas LL8 engine.

The Problem: The Atlas LL8 is one of the most over-engineered inline-six engines ever built, but it is severely choked by the factory air box. The stock intake is a labyrinth of plastic resonators and baffles designed to prioritize silence over efficiency, which creates significant air turbulence and a sluggish throttle response in the mid-range.

The Solution: We engineered this intake to eliminate the factory restrictions. By replacing the baffled plastic tubing with high-velocity T304 aluminum piping, we allow the Atlas LL8 to draw in a larger volume of air with less resistance, correcting the factory design flaws and providing a noticeable increase in engine efficiency.

Why This is the Ultimate Upgrade

• Enhanced Induction Efficiency: By smoothing out the air path, this system can provide gains of up to 10% in horsepower and torque by allowing the engine to breathe without the stock "maze" of resonators.
• T304 Aluminum Construction: Unlike cheap plastic intakes that can heat-soak or crack over time, our lightweight aluminum piping is built for thermal stability and long-term durability.
• Simple Bolt-On Design: Engineered for a precise fit on the GMT360 chassis, this kit utilizes basic hand tools and can be installed in under 60 minutes with no permanent modifications required.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2006 Chevrolet Trailblazer 4.2L L6
• 2007 Chevrolet Trailblazer 4.2L L6
• 2008 Chevrolet Trailblazer 4.2L L6
• 2009 Chevrolet Trailblazer 4.2L L6
• 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 Part Numbers:

4.2L, L6, 2006, 2007, 2008, 2009, LL8, GMT360

The Performance Promise

Buy with confidence. As specialists in the Atlas engine platform, we understand the specific needs of the Trailblazer and Envoy community. This kit is designed to provide a deeper, more aggressive engine note while improving the daily driveability of your vehicle. Backed by real automotive experts and fast shipping.