AP Exhaust 40021 Exhaust Muffler Assembly
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AP Exhaust

AP Exhaust 40021 Exhaust Muffler Assembly

Brand AP Exhaust 40021
Muffler Material Aluminized steel
Fits Hummer · 5 vehicles

Aluminized steel. Resists corrosion for dependable exhaust service.

Muffler assembly. Complete exhaust muffler replacement in one unit.

Cross-references 15931261 for the same application. See all 1.

$149.78Free shipping
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AP Exhaust 40021 Muffler Assembly for Hummer H3

AP Exhaust 40021 is an exhaust muffler assembly built with aluminized steel for corrosion resistance in everyday driving conditions. It is a direct-fit replacement for select Hummer H3 applications with a welded OE-style exhaust layout.

Key Features

  • Aluminized steel muffler material for durable exhaust service
  • Exhaust muffler assembly for rear exhaust repair and replacement
  • OE-style fitment for welded-system applications
  • Fits 2006-2010 Hummer H3, N/A
  • Part number 40021 for catalog matching and search accuracy

Detailed Description

This AP Exhaust muffler assembly is intended for 2006-2010 Hummer H3 models with a welded exhaust system. The aluminized steel construction helps resist rust and heat-related wear, making it a practical replacement when the original muffler assembly has deteriorated, developed leaks, or no longer maintains proper exhaust flow. If you are searching for a Hummer H3 muffler assembly, AP Exhaust 40021 provides a direct application match for the listed vehicles.

This part cross-references GM OE 15931261 for the same application. Search terms such as 2006 Hummer H3 muffler assembly, 2007-2010 Hummer H3 exhaust muffler replacement, and AP Exhaust 40021 H3 exhaust part align with this listing.

What It Is Used For

  • Replacing a rusted or perforated muffler assembly
  • Correcting exhaust leaks at the muffler section
  • Restoring proper exhaust routing on welded OE systems
  • Addressing excessive exhaust noise from a damaged muffler
  • Replacing a worn Hummer H3 exhaust muffler assembly

Installation Notes and Tips

Fits 2006-2010 Hummer H3, N/A. The OE system was a welded assembly, so AP Exhaust recommends replacing all noted parts in the system during service. Verify the vehicle’s exhaust configuration before installation and compare the existing assembly to the part number 40021 for proper application matching.

Quality Assurance

AP Exhaust manufactures exhaust components for direct replacement applications, and this muffler assembly uses aluminized steel to support long-term exhaust service in the listed Hummer H3 fitment.

Related reading

This part fits 5 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2010HummerH33.7LL5N/AWelded Assembly; OE system was a welded assembly, recommend replacing all noted parts [1].
2009HummerH33.7LL5N/AWelded Assembly; OE system was a welded assembly, recommend replacing all noted parts [1].
2008HummerH33.7LL5N/AWelded Assembly; OE system was a welded assembly, recommend replacing all noted parts [1].
2007HummerH33.7LL5N/AWelded Assembly; OE system was a welded assembly, recommend replacing all noted parts [1].
2006HummerH33.5LL5N/AWelded Assembly; OE system was a welded assembly, recommend replacing all noted parts [1].
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
15931261