Chevrolet Silverado / GMC Sierra 2500HD / 3500HD Catalytic Converter Guard (2020-2026)

FSPE Catalytic Converter Guard – Chevrolet Silverado / GMC Sierra 2500HD / 3500HD (2020-2026)

Protect your heavy-duty truck's expensive catalytic converters with the FSPE Catalytic Converter Guard, engineered for 2020-2026 Chevrolet Silverado and GMC Sierra 2500HD/3500HD models with the 6.6L Duramax Diesel or 6.6L gasoline engine. This guard mounts directly to your truck's frame, providing a serious physical barrier that keeps thieves away from one of the most targeted components on the road.

Crafted from CNC-cut 5052 aluminum and available in raw or semi-gloss black powder-coated finishes, each guard is purpose-built for its engine platform — the diesel version stacks three riveted plates to nearly 1/4" thick, while the gasoline version pairs a very large 3/16" main plate with a rear shield and removable oil drain cover.

Key Features

• Theft Prevention: Frame-mounted physical barrier engineered to discourage intruders and protect your converters.
• Diesel-Spec Protection: Duramax version features 3 riveted plates for a combined thickness of nearly 1/4".
• Gasoline-Spec Protection: 6.6L gas version includes one very large 3/16" plate, a 0.08" rear plate, and a removable oil drain cover.
• Enhanced Security: Includes special bolts to make unauthorized removal significantly more difficult.
• Heat Management: Built-in heat extraction vents maintain proper airflow around the exhaust system.
• Finish Options: Raw aluminum (will not rust; may contain surface scratches) or semi-gloss black powder coat for added protection.
• USA Made: Built in the USA with all mounting hardware and installation instructions included.

Specifications

• Material: 5052 Aluminum
• Diesel Guard: 3 riveted plates, nearly 1/4" total thickness
• Gasoline Guard: 3/16" main plate + 0.08" rear plate + removable oil drain cover
• Finish: Raw Aluminum or Semi-Gloss Black Powder Coat

Fitment / Applications

• 2020-2026 Chevrolet Silverado 2500HD / 3500HD (6.6L Duramax Diesel or 6.6L Gasoline)
• 2020-2026 GMC Sierra 2500HD / 3500HD (6.6L Duramax Diesel or 6.6L Gasoline)
• Must have the 2020-2026 body style

Notes

• Download the installation instructions – 6.6L Gasoline (PDF)
• Download the installation instructions – 6.6L Duramax Diesel (PDF)
• A heavy-duty threaded rivnut tool with 1/4"-20 and 5/16"-18 mandrels is required for installation. All other tools required are common.
• Professional installation on a lift is recommended.
• Be sure to select the correct version for your engine — the diesel and gasoline guards are different designs.

Pro Tip: HD trucks sit high enough for a thief to slide under without a jack — which is exactly why they are prime targets and why a frame-mounted guard pays for itself.