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Your cart is empty.DynoMax Ultra Flo Welded performance stainless steel mufflers feature 100-percent welded construction for lifelong durability. The unrestricted, straight-through design dyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower. Each muffler uses our exclusive Continuous Roving Fiberglass (CRF) Technology to absorb unwanted interior resonance while maintaining a deep performance tone. The 'Pure Unadulterated POWER' of DynoMax Ultra Flo Welded mufflers are backed by a Limited Lifetime Warranty and exclusive 90-Day Performance & Sound Guarantee.
Philip G.
Reviewed in Canada on March 17, 2025
It's garbage...don't buy this!
Nana
Reviewed in the United States on September 18, 2024
It was the wrong size for my truck
chris drinnin
Reviewed in the United States on July 8, 2024
Muffler is a direct fit for my 2014 Silverado but that being said it looks well made but the time it took me to cut the old muffler off and weld this new one on was not worth it because it sounds about the same as stock I was looking for a little bit more aggressive sound so if you're looking for anything louder than stock do not buy this muffler take it from me and a couple other people on here
sheldon pemberton
Reviewed in Canada on July 20, 2024
Length and width are great but pipes are 3 in id and 2015 silvarado has 2 3/4 od pupes . Not a big issue with a welder .
Customer
Reviewed in the United States on June 10, 2024
Showed up and got exactly what was described. Fit exactly as it should and was made well.
Will
Reviewed in the United States on May 24, 2024
Got this for my 2017 5.3 Sierra. I wanted something that was a direct fit and easy to install, I did need a couple of reducers and naturally a couple of clamps but it was a very simple replacement. I was worried it would be too loud but it is actually very subtle and sounds like a slightly throatier, healthy OE which is what I was hoping for so if your looking for something that is really aggressive this isn’t it but if your looking for something above factory this will do. I know a lot of people talk about that exhaust flap whether or not to wire it open or just straight remove it but I couldn’t tell you if there is a difference because my factory muffler ate mine so it’s always open but it still sounds fine when I’m running on 4 cylinders and I don’t get any drone. For a $100 muffler this isn’t a bad way to go.
Joe & Gerri A
Reviewed in the United States on May 12, 2024
Very easy to install with clamps. Took me about 5 hours only because this was my 1st time doing an install. Now that I know what to expect should take no more than an hour. Thank you.
M
Reviewed in the United States on November 3, 2023
Note- I used to work at a speed shop selling these and many other mufflers, and have owned various performance cars with various different mufflers since the late 80's.This is really one of the best-designed mufflers out there. It's not stainless, but it is heavy gauge aluminized steel that lasts quite a long time. I bought this one to replace one that I've owned since the '90's and has been on 3 different cars that finally had a seam rust through, that I could probably fix but I wanted to go quieter (the old one was the same layout but next shorter case length) since the vehicle I'm putting it on has a cut-out and I can open it to go MUCH louder when I want to.At idle these mufflers can be pretty quiet and have a nice, loudish low-frequency tone at more open throttle, just note that a longer case length and to a lesser extent more offset between the inlet and outlet make it quieter. As far as performance, if you go to Dynomax's site you'll find information about the actual flow of each muffler as well as how much HP it can support without restriction (it used to be on the main site but I couldn't find it last time, but it is still in their downloadable PDF catalogs). You'll find that compared to just about every other reasonably priced muffle out there these flow better and are as durable as many all stainless mufflers. If you take the time to look them up you'll find a few of the case layouts (including this one and the shorter version of this one) have flow numbers WAY higher than most others and do not present a restriction at any power level you're likely to see on the street (this one is tested at 1800SCFM airflow and not a restriction at up to 818hp for a single muffler). FWIW the car has dynoed at 498hp to the wheels with a single of the next smaller muffler on it, and it doesn't show any change with the cutout open or closed (it just lets me adjust how much noise I want to make)
Amazosara Taylor
Reviewed in the United Kingdom on October 22, 2022
Just fitted the two units for my MOT and they are NOT made from stainless steel. Pissed off as lm not able to return. Don’t buy it!!
Daniel Ramirez
Reviewed in the United States on May 16, 2019
Loves that it was a simple install, that took a muffler shop less than 30 mins to get it on my f150 5.0 . Did t sounds as loud as I thought it would but definitely alot less exhausts stress on the system with the easier flow of cfm's. Highly recommend you take the resonator off as well for a little more ummpff. Great value and good muffler.
Yves St Pierre
Reviewed in Canada on June 13, 2018
Pas le son que j'attendais, même son que l'original. Ne reponds pas a mes attentes.
Hahnz
Reviewed in the United States on March 28, 2012
The Dynomax website gave me all the information I needed to make a decision. It even gave me an idea of what the muffler will sound like. Muffler is quiet at idle which is what you would like to see but when you start moving, there is a nice, not menacing, rumble. As for the muffler's ability to help my mileage, I hope it does but I am not expecting to notice it. First off, on an older truck, a '03 Dodge Ram 2500 with 186K miles, I may not even see it. Because of the muffler design, however, I do believe that I get better performance. There seems to be a little bit more pep in the old girl these days.
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