DynoMax® - Ultra Flo™ Welded Muffler

3 reviews|Item # sp4403
$61.95 - $244.52
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Ultra Flo™ Welded Muffler by DynoMax®. This muffler-back exhaust system includes pipe, clamps and Ultra Flo™ Welded muffler that features unrestricted, straight-through design for a dyno-proven increase in power and maintains a deep throaty tone while absorbing undesirable interior resonance.


  • Unrestricted, straight-through design for a dyno-proven increase in horsepower and torque
  • Engineered to give your car a deep performance tone
  • Stainless steel construction for lifelong protection
  • 100% welded design for long-lasting durability
  • Continuous perforated tube interior construction
  • CRF (Continuous Roving Fiberglass) technology absorbs unwanted interior resonance
  • Straight-through design does not restrict exhaust flow and helps cut back pressure
  • Dyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower
  • “Micro finish” technology creates a blemish free, satin muffler exterior finish
  • Covered by a Limited Lifetime Warranty

The Ultra Flo Welded performance muffler will give your car a powerful throaty tone while providing effective dampening of unwanted interior resonance thanks to CRF (Continuous Roving Fiberglass) technology. Its 100% welded stainless steel construction forms a basis for maximum durability and lifelong protection. The exterior of the muffler is cleaned using “Micro finish” technology that ensures a blemish free, satin finish. The muffler's straight-through design with a continuous perforated pipe inside allows for proper sound absorption while ensuring the free flow of exhaust gases and reduced back pressure. Improved, unrestricted flow is one of the most important factors in gaining horsepower and torque. The Ultra Flo Welded muffler is covered by a limited lifetime warranty and 90-day Performance & Sound Guarantee to make sure it fully meets your expectations.

DynoMax®, a member of the Tenneco conglomerate that also includes well-known names such as Walker, Monroe, Kinetic, etc., is one of the leading North American manufacturers of performance exhaust products. Built on over 25 years of market leadership, it centers on engineering and launching new systems that feature a quality sound, ultimate performance, and long-lasting durability - everything expected from premium exhaust component. The DynoMax Performance Exhaust product line, consisting of a wide variety of mufflers, pipes, and exhaust systems, was first introduced by Walker in 1987. Driven by the theme "Pure, Unadulterated Power," the brand is committed to creating groundbreaking products that reveal the true nature of any vehicle.


Tenneco Inc. warrants qualifying DynoMax® products are covered by a Limited Lifetime Warranty, during which its products are warranted to be free from defects in material or workmanship. This Warranty does not apply to any products that have been subjected to misuse, mishandling, misapplication, neglect (including but not limited to improper maintenance), improper installation, or alterations.

The Warranty is granted to the end-user and applies to products which are purchased, installed, and used for the purposes for which they are originally designed. This Warranty covers defects arising under normal use and does not cover malfunctions or failures resulting from misuse, abuse, neglect, improper installation, or incorrect maintenance.

During the Warranty period, DynoMax will repair or replace, at no charge, a product that is defective in materials or workmanship. DynoMax reserves the right to either repair or replace a defective component at its discretion and reserves the right to substitute an equivalent product under the terms of this Warranty.

Limited Lifetime Warranty Qualifying Products

DynoMax® Ultra Flo™ SS Polished Mufflers

DynoMax® Ultra Flo™ Welded Mufflers

DynoMax® VT® Mufflers

DynoMax® Super Turbo™ Mufflers

DynoMax® Stainless Steel Systems (38XXX and 39XXX Series)

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More



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DynoMax® - Ultra Flo™ Welded Stainless Steel Oval Exhaust Muffler
DynoMax® - Ultra Flo™ Welded Muffler
Average Rating: 4.3 of 5
3.3 of 5
No Show Piece, but a Good Value
Looking to replace the exhaust system on my 1999 Dodge Dakota, RWD 3.9L Magnum V6, and wanted something a little more free flowing than stock. Did some research, and found this offering from Dynomax. Wanted stainless steel, and welded seams were a plus. Price was fair as well. Got the item fairly quickly. Inspected the muffler out of the box, no damage, but this ain't show piece. Welds are extremely sloppy, so either the robot on the line was off that day, or these are apprentice welds. End cuts for the inlet and outlets were pretty rough as well. I don't much care about appearance, so long as the thing is sealed. I gave it 2 stars for appearance in case you're looking for something nice. For a universal fitment muffler, this was a no fuss install for my truck. Good bang for your buck, if appearance isn't important. Sounds good at idle, a little raspy on acceleration, and an obvious drone at 2500-3000 RPM on acceleration. I can deal with it. Overall, I'm satisfied.
Posted by (Rahway, NJ) / 1999 Dodge Dakota
Was this review helpful for you? Yes
5 of 5
Great Noise
I' ve put it with cold air intake and it just gives you a full power and sounds gooood.
Posted by (Abu Dhabi, AA) / 2010 Nissan Xterra
Was this review helpful for you? Yes
4.8 of 5
Improved Performance
The product arrived just in time, I installed it on my car and it gained a surprising amount of horsepower. Great product, reasonable price, and fast shipping. Thanks!
Posted by (Montgomery, NY) / 2009 Chevy Colorado
Was this review helpful for you? Yes
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