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Trusted Gear for Serious Off-Roaders!
Trusted Gear for Serious Off-Roaders!
Sierra 1500 undercarriage view with mounted Cat Shield by MillerCat

MillerCat GMC Sierra 1500 2019+ Cat Shield

by MillerCat
SKU GM-001
$420.00

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Why Choose the MillerCat Shield for Your GMC Sierra 1500?

🛡️

Four-Converter Protection

Our multi-piece design provides comprehensive coverage for all four of your Sierra's valuable catalytic converters, leaving no weak points.

🔩

100% Bolt-On Installation

Mounts directly to your truck's frame using existing factory holes. No drilling or permanent modifications are required.

💨

Engineered for Performance

Strategically placed louvers and vents ensure proper cooling for the exhaust and transmission, protecting powertrain health.

🇺🇸

Proudly Made in the USA

From 3D scanning to manufacturing, every shield is crafted in California, ensuring unmatched quality and precision.

🔒

Proprietary Security Hardware

Our included tamper-resistant screws require a special bit (provided), adding a critical layer of defense standard tools can't beat.

🌦️

All-Weather Durability

Crafted from high-grade aluminum, the MillerCat shield provides a lifetime of protection and will never rust, unlike steel alternatives.

Description

Miller CAT Anti‑Theft Cat Shield | Fits GMC Sierra 1500 2019+ | Make Your Sierra Invisible to Thieves

Your GMC Sierra 1500 is a prime target for catalytic converter thieves. Its high ground clearance and four valuable converters make it a quick and profitable job for criminals, leaving you with a disabled truck and a repair bill that can easily exceed $5,000.

Secure your vehicle and your peace of mind with the MillerCat GMC Sierra 1500 2019+ Cat Shield, the ultimate defense against this costly crime.

A thief's greatest assets are speed and silence. The MillerCat Shield robs them of both. By creating an imposing, multi-plate barrier secured with tamper-proof hardware, we turn a 60-second job into a loud, difficult, and high-risk ordeal. This isn't just a deterrent; it's a clear message to criminals that your truck is fortified by the best in the industry, forcing them to find an easier, unprotected target.

Industry Recognized: SEMA Award-Winning Design & Engineering

Key Benefits of the MillerCat System

  • Precision-Engineered Fit

    How can you ensure the best cat shield fit for a 2019+ GMC Sierra? By using a product designed from a 3D scan of its exact frame. Our process guarantees a perfect, rattle-free fit that provides maximum coverage without interfering with chassis components.

  • Protects Without Overheating

    A solid plate can trap excessive heat, risking damage to your transmission and sensors. We integrate specially designed louvers that promote airflow, allowing your vehicle's sensitive components to cool as intended by the manufacturer.

  • A Proactive, Cost-Saving Investment

    The replacement cost for four catalytic converters, plus potential O2 sensor and exhaust damage, can be astronomical. The MillerCat shield is a one-time investment that saves you from these massive expenses and the severe headache of dealing with theft.

 MillerCat Cat Shield installed on the undercarriage of a 2019+ GMC Sierra 1500

Technical Specifications

Vehicle Fitment 2019+ GMC Sierra 1500
Material High-Strength 5052 Aluminum
Hardware Proprietary Tamper-Resistant Screw Kit
Included Tools One (1) Security Screw Driver Bit
Installation 100% Bolt-On (No Drilling Required)
Country of Origin Made in the USA

Frequently Asked Questions

+ Does this shield fit my Sierra with the 5.3L V8 and the 6.2L V8?

Yes, our shield is designed to be compatible with all major engine options for the 2019+ Sierra 1500, including the 5.3L V8 and 6.2L V8. The mounting points on the frame are consistent across these models.
+ Will this fit if I have an aftermarket lift kit installed?

In most cases, yes. Our shield mounts to the factory frame, so as long as your lift kit does not modify or obstruct these specific mounting locations, it will be compatible. It is not compatible with drop bracket style lift kits that alter crossmember locations.
+ Can I take my truck through an automatic car wash with the shield installed?

Yes. The shield is securely bolted to the frame and does not have any protruding parts that would interfere with undercarriage sprayers or get caught in most automatic car wash systems. It is perfectly safe.
+ Will this shield interfere with regular maintenance like oil changes?

No. The shield is designed to protect the catalytic converters, which are located further back. It does not obstruct access to the engine oil drain plug, oil filter, or transmission pan, so all routine maintenance can be performed normally.
+ Does this product also function as an off-road skid plate?

While the shield offers significant protection against road debris, its primary design and material thickness are optimized for theft deterrence. It is not intended to be a dedicated off-road skid plate for supporting the full weight of the vehicle or absorbing severe rock impacts.
Prop 65

California Residents

Prop 65 Warning- Product may contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov

Proposition 65 is a California law passed in 1986. Its goals are to protect drinking water sources from toxic substances that may cause cancer and birth defects and to reduce or eliminate exposures to those chemicals generally, for example in consumer products, by requiring warnings in advance of those exposures.

The regulation requires the State of California to revise and republish yearly a list of chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. The current list contains over 900 naturally occurring and synthetic chemicals. This regulation also requires manufacturers to place warnings on products that contain any of the chemicals listed by the State of California. No other states require warnings of this nature, and products with Prop 65 warning language are legal to sell in all states. Detailed information regarding requirements for compliance to the California Prop. 65 is can be found at: www.P65Warning.ca.gov

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ExtrailAuto.

MillerCat GMC Sierra 1500 2019+ Cat Shield

Reviews

Let customers speak for us

from 445 reviews

Great service from their staff. Robert help me through all the process with a request I had, he responded all emails in a timely manner and provided great help.

Anonymous
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