Dynomax 39454 Exhaust System Kit

Dynomax Ultra Flo Welded Cat-Back Exhaust

Dynomax Ultra Flo Welded part number 39454 is a stainless steel cat-back exhaust system built for 2007-2008 Chevrolet Silverado 1500 and 2007-2008 GMC Sierra 1500 models with single exhaust. It uses a straight-through muffler design and mandrel-bent tubing to support freer exhaust flow while maintaining a performance tone.

The Ultra Flo Welded line focuses on welded stainless construction, reduced interior resonance, and a bolt-on layout for straightforward exhaust replacement on full-size GM trucks. This system is a direct fit for Silverado 1500 and Sierra 1500 applications listed below.

Key Features

• Part number 39454
• Cat-back, single-exhaust system
• Fits 2007-2008 Chevrolet Silverado 1500, single exhaust
• Fits 2007-2008 GMC Sierra 1500, single exhaust
• Stainless steel pipe and muffler construction
• Straight-through Ultra Flo Welded muffler design
• Mandrel-bent tubing for consistent exhaust path
• Round, angle-cut tailpipe exit style
• Band clamp connection style
• Mounting hardware included

Product Details

Dynomax 39454 is a premium performance exhaust system for truck owners looking to replace the factory cat-back assembly with a stainless steel setup. The system includes a flanged intermediate pipe, muffler, tail pipe, and clamps, with a 3-inch pipe diameter and a single-exit layout. The Ultra Flo Welded muffler uses a straight-through internal path and CRF technology to reduce unwanted cabin resonance while keeping a deeper exhaust note.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Uses

• Replacing a restrictive factory cat-back exhaust on a Silverado 1500 or Sierra 1500
• Restoring exhaust flow after corrosion or damage in the original system
• Updating the truck’s exhaust tone with a deeper performance sound
• Improving exhaust system durability with stainless steel construction
• Servicing 2007-2008 GM half-ton trucks with single exhaust

Installation Notes

Install as a bolt-on cat-back replacement on the confirmed vehicle applications. Verify single-exhaust configuration, 3-inch inlet and outlet alignment, and available clearance before installation. The system uses band clamps and mandrel-bent sections for fitment on the listed Silverado 1500 and Sierra 1500 models.

Quality Assurance

Dynomax backs the Ultra Flo Welded muffler design with a Limited Lifetime Warranty and a 90-Day Performance & Sound Guarantee. Part number 39454 is built around welded stainless construction for long-term service in performance exhaust applications.