Dynomax 17221 Exhaust Muffler

Dynomax Ultra Flo Welded Performance Muffler

Dynomax Ultra Flo Welded Part Number 17221 is a universal stainless steel exhaust muffler built for performance applications that need straight-through flow and a deep tone. Its 3-inch inlet and outlet, oval body, and reversible layout make it a practical choice for custom exhaust work on trucks and performance builds.

Compatible With 2008-2012 Ford F-250 Super Duty, 2008-2010 Ford F-350 Super Duty, 2009-2012 Chevrolet Colorado, and 2009-2012 GMC Canyon. This part number 17221 is also a fitment match for universal 3-inch exhaust systems where the listed vehicle dimensions and routing apply.

Key Features

• Stainless steel body with 100-percent welded construction
• Straight-through absorption design for high-flow exhaust routing
• 3-inch inlet and 3-inch outlet with offset inlet configuration
• Oval muffler body measuring 14 inches long, 9.75 inches wide, and 4.5 inches high
• Reversible design for flexible installation orientation
• Continuous Roving Fiberglass (CRF) technology to reduce interior resonance
• Deep performance tone for street and truck applications
• Universal fitment for custom exhaust fabrication

Product Details

The Dynomax Ultra Flo Welded line focuses on unrestricted exhaust flow with a welded stainless construction that stands up to demanding use. Part Number 17221 uses an absorption-style muffler core and CRF packing to control unwanted cabin resonance while keeping a deeper exhaust note. With a 3-inch main piping diameter and an overall length of 19 inches, it is suited to custom exhaust systems on the Ford F-250 Super Duty, Ford F-350 Super Duty, Chevrolet Colorado, and GMC Canyon.

Dynomax Ultra Flo Welded Part Number 17221 is a strong option for builders looking for a universal performance muffler with a compact oval profile and a single offset inlet layout. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Uses

• Replacing a restrictive factory muffler with a freer-flowing design
• Reducing interior drone while keeping a performance exhaust tone
• Building a custom 3-inch exhaust system for a truck or compact pickup
• Addressing rusted or damaged stainless or mild-steel muffler sections
• Upgrading exhaust sound on a Ford F-250 Super Duty, Ford F-350 Super Duty, Chevrolet Colorado, or GMC Canyon

Installation Notes

Verify inlet and outlet orientation before welding or clamping into place. The reversible body helps with routing, but final fit depends on vehicle clearance, pipe alignment, and exhaust hanger placement. Confirm 3-inch pipe sizing and measure available space for the 19-inch overall length and offset inlet position before installation.

Quality Assurance

Dynomax backs the Ultra Flo Welded muffler line with a Limited Lifetime Warranty and a 90-Day Performance & Sound Guarantee. Part Number 17221 is built for performance use with welded stainless construction and a straight-through internal design.