Dynomax 17571 Exhaust Muffler - Left

Dynomax Ultra Flo Welded Direct Fit Muffler

The Dynomax Ultra Flo Welded Direct Fit muffler is a stainless steel performance exhaust muffler built for direct OE replacement on select Ford Mustang applications. Part number 17571 uses a straight-through absorption design to reduce restriction while maintaining a deep exhaust tone.

Built for 2005-2009 Ford Mustang, left-side fitment, this muffler is part of the Ultra Flo Welded Direct Fit line and is shaped for a specific installation. The 409 stainless steel body, oval housing, and welded construction support long-term durability in performance exhaust systems.

Key Features

• Direct OE replacement fitment for select 2005-2009 Ford Mustang left-side applications
• Part number 17571 from Dynomax Ultra Flo Welded Direct Fit
• 409 stainless steel body with natural finish
• Straight-through absorption muffler design
• Oval body shape with single inlet and single outlet
• 2.5 in. inlet diameter and 3.5 in. outlet diameter
• Welded stainless construction for durability
• CRF technology helps reduce interior resonance while keeping a performance tone

Product Details

Dynomax Ultra Flo Welded Direct Fit mufflers are engineered for performance-focused exhaust replacement where a factory-style fit is required. This model, part number 17571, is listed for 2005-2009 Ford Mustang left-side applications and uses a specific-fit layout with an offset inlet configuration. The Ultra Flo Welded line emphasizes unrestricted exhaust flow, stainless steel construction, and sound control through Continuous Roving Fiberglass (CRF) technology. For shoppers searching for a Ford Mustang muffler replacement, Mustang left muffler fitment, or Dynomax 17571 direct fit exhaust muffler, this unit matches those needs with confirmed vehicle coverage.

Common Problems It Can Address

• Restricted exhaust flow from a worn or damaged muffler
• Excessive interior resonance from an aging exhaust system
• Corrosion concerns on a factory muffler body
• Loss of performance-oriented exhaust tone
• Need for a direct-fit replacement on a 2005-2009 Ford Mustang left-side exhaust location

Installation Notes and Tips

Verify left-side placement and inlet/outlet dimensions before installation. This muffler is listed as a specific fit and is not reversible. One fitment note states that 2005-2009 Ford Mustang left-side applications also require part number 36444. Confirm the existing exhaust layout, pipe diameter, and hanger position against the vehicle before final assembly. This part cross-references no additional part numbers beyond the noted application reference.

Quality Assurance

Dynomax backs the Ultra Flo Welded muffler line with a Limited Lifetime Warranty and a 90-Day Performance & Sound Guarantee. The welded stainless steel construction and performance-oriented design reflect the Ultra Flo Welded Direct Fit product line for Mustang exhaust replacement applications.