'04-05 Guys,

I was in a shop the other day and saw a dynomax ultraflow muffler sitting on the shelf boxed up. I saw a chart on the box that showed the flow and CFM's of 3 or 4 mufflers in a chart, including the dynomax ultraflow as compared to flowmaster, magnaflow, and some other brand. The dynomax ultraflow blew ALL the other 3 mufflers away in CFM's by a long shot. Does anyone know anything about these mufflers and the sound and performance of them as compared to the other brands? Does anyone out there have one on their '04-05 trucks? I wonder if they just used the lowest flowing muffler from each brand to put on that chart against their top flowing muffler to make it look so good?

 

Keep in mind that some trucks need back pressure to perform and put out the most power. I have heard that the lightning for example does not gain horse power but rather losses some with a higher flowing exaust. I am not by any means a expert, Just passing on what I have been told in the past!

 

That's true mwheue, I guess it could be that certain trucks they test the mufflers on could make that chart change. I just wonder though how the dynomax ultraflow sounds and how well it performs on the '04-05 f150's. It's a good company.

 

If they are still made the same way they were 7 years ago, Dynomax mufflers are LOUD. I had a 1990 Dodge Daytona 2.5 Turbo auto-cross car in Germany. Mind you, turbo's actually quiet the exhaust down alot, which is why diesel truck with 6" tailpipes are no where near as loud as a gas engine. That Daytona sounded like a jet engine at max take off power when I would run the car. I was running a different muffler on this Daytona & noticed a definite improvement in power when I switched to the Dynomax muffler.

My 1991 Chevy had a Dynomax OEM replacement muffler & it was noticably louder & made more power than the Meinekie muffler that was on it.

The local muffler shop has a drag racing team and they use Dynomax mufflers on their drag cars, which are 2 70 something Nova's. They are LOUD, REAL LOUD.

My $0.02...

KC-10 FE out...

 

I've only heard one dynomax in my days, and that was a few years ago on an early 90's model chevy fullsize pickup. It had a decent sound to it, but it was not as loud as flowmaster 40's are, and probably not as deep sounding either.

 

i have a 70 elcamino and just had the exhaust redone. i researched different mufflers and exhaust at length (about 2 years... waiting for funds). i do not claim to be an exhaust or muffler expert, but i did stay at a holiday inn express last night.

dynomax makes a few different perfromance mufflers. (actually i think they are a division of walker which makes tones of mufflers) the ultra flow race bullets are very loud. they are not for the street unless you don't want to talk in your car or are deaf.
dynomax ultra flows are oval type mufflers that are a straight thru design. kind of like a glass pack, (you can look straight thru it). the differance is, a glass pack has a small amount of sound deadening material (fiberglass) and actually has a restriction inside (but how? its straight thru isn't it?). the restriction is a small perferated metal (kid of looks like a cheese grader) that directs some of the xhaust thru the fiberglass. so if you had a 2.5" glass pack the flow thru the miffler is down to about 2.25". the dynomax ultraflo does not have this cheese grader inside. but it is an oval type muffler so it has more sound deadening material. also, the ultraflows come in different case sizes and different lengths. smaller and shorter is louder (less material). bigger and longer is quiter. ultraflows and magnaflows are basically the same thing. magnaflows are straight thru and have some kind of whiz-bang space age sound deadener. i have seen the data you mention, that the ultraflows outflow everything (including the magnaflow). in this comparison they did not compare it to the magnaflow straight thru design, but magnaflows "chambered" muffler (funny they don't mention that isn't it)

either way, ultraflows straight thru and magnaflows straight thru are about the same. i ended up with the magnaflows becuase i like the construction a little better. on my camino i got the short, small case style for a nice muscle car sound. at idle and cruize it is very quite, but when i hit the pedal and wake up that chevy big block.... it roars.

check out their websites. compare the info. took me 2 years. i am happy with what i got.

 

oscar a wiggy,

thanks for the info. Did you ever hear one of the ultraflows? You said they flow about the same as magnaflow, but I wonder about the sound of it? I wish someone out there had one on their '04-05 f150. I wish the exhaust shops would be able to stick a muffler on and let you hear what it sounds like before buying. Most companies don't have sound clips on their sites for everyone's application vehicle, plus sound clips don't do justice.

 

It is usually down to preference, since most mufflers have a different sound. I had magnaflow duals on a small block chevy and loved them, but hear a set on an F150 and decided I like the flowmasters more. Depending on where you live (snow belt or sun belt), you may want to look at materials too, since stainless steel does not rust....

 

Ive got it on my truck and love it, all i did was the muffler and change the tip. the only way i can describe the sound is quiet at idle, no interior drone, and when you get on it it sounds like a performance sound not a deep loud obnoxious sound like you hear from the local good old boys. and for the price i dont think you can beat it.

 

I'm new to the site,but I thought I might express my thoughts about the Mufflers in question. Had Dynomax's on a 94 Bronco with a 351 in it and they sounded great. Also put a pair on a 2000 Expy, they also sounded great. My Lightning already had a Magnaflow Catback on it when I got it, so they stayed. I personally liked the performance of a Dynomax as compared to Flowmasters. Flowmasters are louder, but I don't think they offer the performance that Dnnomax and Magnaflow do. My .02 for what it's worth

 

I had a Dynomax on my 96 ford f-350 (460) and thought it had a very good deep sound to it. I had a Flowmaster 40 series on my 03 Chevy Silverado (5.3)and did not like drone, Too loud! But on my 04 f-150 (5.4) I have a Magnaflow and also like the deep sound of it

 

Okay, I can't really tell what is what because we all have different preferences. I like a mean sounding exhaust with a growl to it like it might just bite you. But I don't like obnoxious sounding exhaust like glasspacks or straight pipes. From what I gather, magnaflow does not provide that, and from what I've heard of their sound clips too. I have a flow original 40 on my old '93 f150 and like the sound well. I think my new '04 will sound much better though. I'm considering strongly the super 40 because it's not supposed to have drone and it is supposed to flow much better, plus the deep growl. Flowmaster mufflers don't just sell for the heck of it, they sell because a lot of people like their sound. But now there seem to be some better flowing mufflers with as good a sound as flowmaster........dynomax???? (the question at hand), IMCO, aeroturbine, and maybe some other brand. IMCO sound clips are good, but not sure about a new f150.

As far as performance, magnaflow and all those listed above supposedly flow better than flowmaster. I'd like to see a chart of like mufflers with like qualities instead of dynomax's best up against magnaflow's worst or something dumb like that. That's some priceless info right now for all of us, if it could be found by someone. I've been searching. I've never really seen a flowmaster dyno I don't think. I'd like to have magnaflow performance, but not for the price they charge and also because I don't think I'd be happy with their sound, I need it just a little deeper than what they offer. So I'm looking at other options.

 

higdogg,

yes, its a tough choice. "i want the straight thru flow but i would like the awesome super 40 growl". that's what i thought too. i have never actually heard the ultraflow muffler. i can only guess that it would sound similiar to the magnaflow.... but this is just a guess. i have heard the super 40 on a friends ram truck. sounds very nice. like you said, kind of like it would bite-ya. and to be honest i came this close (put fingers 1mm apart) from going with the super 40. i went with the magnaflow becuase i'm already gettin old and my super loud exhaust days are behind me. also, if it was too loud the wife wouldn't want to ride in my elcamino. i think either way you go, they are both fine products and both flow much better than stock.

see ya - oaw

 

oscar,

I bet the super 40 sounds good, I'm just having trouble figuring out what it sounds like at idle and cruising speeds. I've heard both ways--description says its quiet at those times, but then I've read forums that it's got a drone or something. I just think everybody has a different way of explaining stuff and that makes it harder to decide what I want. I've had a orig. 40 for years on my old '93 f150 and I don't mind a little drone once in a while. I like to hear the muffler when I drive, that's why I want an exhaust system. If I want HP I'll buy something better than exhaust system. My truck is equipped w/ 300 HP, that's quite a bit and plenty for me unless I'm going to be hauling rock or something in the unforeseeable future. But on the other hand, I do have a nice job at a nice place, and I don't want to be the redneck guy that drives in every day with a loud and annoying exhaust, plus people ride with me once in a while. I think magnaflow sound would be great for that purpose, but I know for sure that I still want a little more than what magnaflow produces in sound. I guess that means flowmaster or one of the other brands I listed in a previous post. I doubt I'll go with dynomax now, just wondered what it sounds like compared to flowmaster, but I guess nobody really knows.