• Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine
  • Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine
  • Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine
  • Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine
  • Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine Default Title

Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine

$149.99
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Dominate the Trail: Cold Air Intake for Your Hummer H3/H3T Vortec 3700 L5

Who It’s For: Designed specifically for Hummer H3 and H3T owners running the legendary Vortec 3700 L5 engine, whether you’re tackling technical terrain, cruising the highway, or just want that distinct 5-cylinder growl to match your rig’s rugged attitude.

The Problem: From the factory, your Vortec 3700 L5 is choked by a restrictive air intake system. GM prioritized quiet operation over performance, resulting in a convoluted air path, a small airbox, and a filter that can’t keep up when you truly lean into the throttle. We’ve all felt that slight hesitation, that lack of urgency when you need power most. It’s not the engine’s fault; it’s the intake limiting its true potential, especially off-road or when towing where consistent airflow is critical.

The Solution: This isn’t just another bolt-on; it’s an engineered solution to correct the factory’s oversight. We’ve replaced the stock bottlenecks with a precision-crafted cold air intake that delivers a massive, unimpeded charge of cooler, denser air directly to your Vortec 3700 L5’s throttle body. The result? Sharpened throttle response, noticeable gains in horsepower and torque across the RPM range, and an induction note that finally lets your 5-cylinder beast sing its song.

Why This is the Ultimate Upgrade

  • Unleashed Performance: Experience immediate and measurable gains in horsepower and torque, improving acceleration and giving your Hummer more grunt for tough climbs or highway passing. You’ll feel the difference, especially in the mid-range where the L5 really benefits from optimized breathing.
  • Rugged Durability & Premium Airflow: Constructed with three 3" 6061-T6 lightweight anodized aluminum pipes, this system isn’t just about flow – it’s built to last. Paired with a high-flow, washable micro cotton filter, you get superior debris protection without sacrificing precious air volume.
  • Direct Bolt-On & Optimized Integration: Engineered for a straightforward installation, this kit mounts directly to the throttle body, eliminating lag. It includes a dedicated MAF sensor adapter and an air breather filter, ensuring proper sensor readings and seamless integration with your H3’s ECU.

Technical Specifications

Fitment 2007-2012 Hummer H3 & H3T
Engine Family Vortec 3700 L5 (3.7L 5-Cylinder)
Factory Ratings 242 HP @ 5600 RPM & 242 lb-ft Torque @ 4600 RPM
Part Numbers N/A - See “What’s Included” for component details

Compatibility & OEM Reference

Fits the Following Vehicles:

  • 2007 Hummer H3 3.7L L5
  • 2008 Hummer H3 3.7L L5
  • 2009 Hummer H3 3.7L L5
  • 2010 Hummer H3 3.7L L5
  • 2009 Hummer H3T 3.7L L5
  • 2010 Hummer H3T 3.7L L5
  • 2011 Hummer H3T 3.7L L5
  • 2012 Hummer H3T 3.7L L5

Interchange Part Numbers:

Not provided in product data.

The Performance Promise

Buy with confidence. Backed by real automotive experts and fast shipping.

Engine Safety Rating
Difficulty 

Fitment

Make

Hummer

Engine Size
  • 3.7L

Year
  • 2007
  • 2008
  • 2009
  • 2010
  • 2011
  • 2012

Installation & Tools

The Wrench Time

  • Estimated Time: 45-60 Minutes
  • Difficulty: 3/10 - Basic hand tools and straightforward bolt-on. The biggest hurdle on the 2007-2012 Hummer H3 3.7L is fighting the bulky factory resonator box.

Tools You Will Need

  • 10mm Socket & Ratchet (For the battery terminal, airbox mounts, and heat shield bolts)
  • 8mm Nut Driver or Socket (For factory and aftermarket hose clamps)
  • T20 Torx Driver (Critical for removing the factory MAF sensor)
  • Flathead Screwdriver (For popping harness clips and prying stubborn boots)
  • Needle Nose Pliers (For compressing factory spring clamps on breather hoses)
Mechanic’s Pro Tip (The "Gotcha"):
The Atlas 3.7L inline-5 engine is notorious for brittle plastic PCV/crankcase breather hoses. When pulling the massive factory resonator box off the top of the engine, pull straight up and do not twist forcefully, or you will snap the plastic breather nipple. Also, H3 forums universally agree: since removing the intake exposes the throttle body, take 5 minutes with some throttle body cleaner and a rag to wipe the carbon out of the bore. The 3.7L is highly sensitive to a dirty throttle body, which causes a notoriously rough idle.

Phase 1: Removing the Factory Part

  1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent check engine lights and reset the ECU’s fuel trims.
  2. Unplug the MAF Sensor: Locate the Mass Air Flow sensor on the factory intake tube. Slide the red locking tab backward with a flathead screwdriver, press down on the black tab, and pull the harness free. Tuck the wire out of the way.
  3. Loosen the Intake Clamps: Use an 8mm nut driver to loosen the hose clamp securing the intake tube to the throttle body, and the clamp securing the tube to the lower airbox.
  4. Disconnect the Breather Hoses: Locate the hard plastic PCV breather hose running into the factory resonator. Pinch the grey or green locking tabs with your fingers (or gently with pliers) and pull the hose straight off. Be extremely gentle—this 2007-2012 factory plastic is highly prone to cracking.
  5. Remove the Factory Resonator and Airbox: Grab the large factory resonator box sitting over the engine block and pull it straight up to pop it off its rubber mounting grommets. Next, use a 10mm socket to remove the bolts holding the lower airbox to the inner fender well, and lift the entire lower assembly out of the engine bay.

Phase 2: Installing the Cold Air Intake

  1. Assemble and Mount the Heat Shield: Drop the aftermarket heat shield or new lower airbox into the factory mounting location. Secure it using the supplied hardware and a 10mm socket.
  2. Transfer the MAF Sensor: Using your T20 Torx driver, carefully unscrew the factory MAF sensor from the old intake. Pull it straight out. Do not touch the delicate wire element inside the sensor! Insert the MAF sensor into your new intake tube, ensuring the airflow arrow points toward the throttle body. Secure it with the new supplied screws (do not reuse the coarse factory screws in a metal tube).
  3. Mount the New Intake Tube: Slide the provided silicone couplers onto the throttle body and the new airbox adapter. Slide the aftermarket intake tube into the couplers. Hand-snug the worm-gear clamps. Once everything is aligned without binding, lock all clamps down tight with your 8mm nut driver.
  4. Route the New Breather Line: Connect the supplied silicone breather hose from the engine’s PCV port to the new nipple on the aftermarket intake tube. Secure both ends with the provided clamps using pliers.
  5. Final Connection and ECU Relearn: Reconnect the MAF sensor wiring harness and push the red locking tab back in. Reconnect the negative battery terminal with your 10mm wrench. Turn the key and start the engine. Do not touch the gas pedal for 20 seconds. Let the vehicle idle so the ECU can properly adjust to the new, higher volume of airflow.

Disclaimer: This is a general guide provided for the 2007-2012 Hummer H3 3.7L. Always refer to your factory service manual for exact torque specifications and safety procedures.

Warranty

All products are backed by our Limited Lifetime Warranty. We stand by our quality. [See terms]
Cold Air Intake for Hummer H3 3T (2007-2012) 3.7L 5 Cylinder Engine

$149.99