Flowmaster 40 Series Delta Flow Offset/Offset Oval Muffler; 2-Inch Inlet/2-Inch Outlet (Universal; Some Adaptation May Be Required)

Signature Flowmaster Sound. A Flowmaster 40 Series Delta Flow Muffler is the easiest way to give your Sierra a loud aggressive sound. An oversized case helps keep resonance down. In addition, the free-flowing design also improves exhaust scavenging for increased horsepower and torque. Measurements include a 2” inlet diameter, 2” outlet diameter, 13" body length and 19” overall length. Transform your truck with a Flowmaster 40 Series Delta Flow Muffler. 

Aluminized Steel Construction. Flowmaster is known for making products that stand the test of time. That’s why this 40 Series Delta Flow Muffler is built from heavy-duty aluminized steel. Mig welding construction makes the muffler ever more durable. To resist corrosion, it’s covered in a gray finish. 

Modifications Required. This Muffler was designed to be used on mutliple applications, as it is not a direct fit replacement part. In order to install this Muffler properly on your vehicle, some modifications to the exhaust system will be required.

3-Year Limited Warranty. Flowmaster backs its 40 Series Delta Flow Mufflers with a 3-year limited warranty. Some limitations may apply, see manufacturer’s warranty information for details.  

Application. This Flowmaster 40 Series Delta Flow Muffler fits all 1999-2026 GMC Sierra Models. To ensure a precise fit, check the measurements of your truck’s factory muffler.

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