Dynomax 17557 Exhaust Muffler

Dynomax Ultra Flo Welded Performance Muffler

The Dynomax Ultra Flo Welded Universal exhaust muffler is built for drivers who want a straight-through performance muffler with stainless steel construction and a deep exhaust tone. Part number 17557 is a universal-fit option for custom exhaust work and direct replacement-style applications where 4-inch inlet and outlet sizing is required.

Key Features

• Ultra Flo Welded Universal performance muffler from Dynomax
• 100-percent welded stainless steel body for durable construction
• Straight-through absorption design for high exhaust flow
• Continuous Roving Fiberglass (CRF) technology helps reduce interior resonance
• Oval muffler body with offset single inlet and single outlet
• 4-inch inlet and 4-inch outlet diameter
• Natural finish with stainless steel body material
• Part number 17557

Product Details

Dynomax Ultra Flo Welded Universal part number 17557 is engineered as a high-performance exhaust muffler for custom builds and universal applications. The oval stainless steel body measures 25 inches long with an overall length of 30 inches, 11.5 inches wide, and 8.25 inches high. Its absorption-style, straight-through internal design supports strong exhaust flow while CRF technology helps control unwanted cabin resonance without changing the performance-oriented tone.

This muffler is a practical choice for Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, GMC Sierra 3500 HD, Ford F-250 Super Duty, Ford F-350 Super Duty, and Dodge Ram 2500 or Ram 3500 applications listed in the fitment data. It is also a relevant search match for drivers looking for a 4-inch universal performance muffler for 2004-2017 heavy-duty truck exhaust systems. Part number 17557 is commonly searched alongside Dynomax 17557 for these truck fitment needs.

What It Helps Address

• Replacing a restrictive factory muffler with a freer-flowing performance design
• Reducing interior drone and resonance in a custom exhaust setup
• Restoring exhaust tone on a worn or damaged muffler
• Supporting 4-inch exhaust system builds on heavy-duty trucks
• Meeting universal-fit exhaust fabrication needs for truck applications

Installation Notes and Tips

Compatible With custom exhaust fabrication and universal-fit installations that use 4-inch inlet and outlet piping. Verify overall length, body dimensions, inlet offset, and available underbody clearance before welding or final placement. Because this muffler is not reversible, confirm inlet and outlet orientation during mock-up. For vehicle-specific searches, this part is commonly referenced for Chevrolet Silverado 2500 HD, GMC Sierra 3500 HD, and Ford F-250 Super Duty exhaust projects.

Quality Assurance

Dynomax backs the Ultra Flo Welded line with a Limited Lifetime Warranty and a 90-Day Performance & Sound Guarantee. The welded stainless steel construction and straight-through design are intended for long-term performance use in universal exhaust applications.