snake2472

Just got my truck back with the above ^^^ exhaust set and my feedback is... disappointing!

Originally I told my muffler shop that I wanted a muffler with moderate rumble with a tolerable drone - I had my choice but I went with their recommendation thinking that they've done this a ling time and they were the experts. They suggested the Dynomax Super Turbo (true twin setup) with a 2.5" piping. So I did a a good amount of reading and searching regarding this muffler - according to the Dynomax website; this is their most quietest muffler among their lineup so I raised this point to the shop. I informed them that having a twin turbo that makes the engine very quiet + a muffler that is also rated quiet would probably not produce the slightly deep rumble that I was looking for (Im not looking for a V8 rumble, I'm aware that I still have a V6) but they said that this is a good muffler (I have not doubts that it is - it just doesnt match my engine type.) so I allowed them to proceed. Upon pickup right before start up, I ask the guy how it sounded... He gave me a runaorund answer like... "Ahhh the rev limiter really doesn't allow the engine to roar..." "I like my cars nice and quiet..." (well its not his to begin with) and to.. "If you dont like it bring it back..." I understand his reasoning behind putting a 2.5" piping because accdg to him, why put a 3" if the catback piping size towards the resonator is 2.5". But my question to him was then why is my oem pipes 3" behind the muffler? All I wanted was him to replicate this setup... Is that unreasonable?

So I will definitely bring it back to get it fixed or replaced now with the setup that I want. I'm thinking of a Dynomax SuperFlow with 3" piping post muffler.

So how does it sound? I drove it about 100 miles to get a feel for it... It sounds constricted and kinda like drowning. Since the ecoboost works on low rpms, the muffler plateaus and you actually dont hear anything... Mostly. When I mash the pedals to accelerate or pass, it sounds like its drowns itself (i cant describe it exactly but it doesnt sound pleasant) and its sounds constricted. I will try to get a sound clip soon.

Bottomline (My opinion only): Dynomax Super Turbo is not a good match for the Ecoboost engine if you're looking for a slightly aggressive rumble.

racinwarrior

do not use a chambered muffler in a vehicle with turbos. I do not know the specs on the muffler you are looking at, but dont get a chambered one

Bobtail74

Dynomax is the performance brand of Walker Exhaust company. High quality oem replacement mufflers and exhaust components are the main products for the company. They were actually ahead of the game in muffler technology going back to the 1980's.

5ohxlt

odon't know how commited you are to those particular mufflers, but i have always went with chambered MAC mufflers, as far as that deep throaty rumble it can't be beat and price is very good, also never had a set go bad in 12yrs. only thing is i don't know what an acceptable amount of drone is for you.

the set up i had before that i think i will go with again was a custom true duel with a h-pipe but it was ran down one side with muffles side by side exiting in-front of the rear wheels.

kinda like this but the mac's are square so they were on turned sideways.

Ttrot

^ What is that for? Looks very well done.

+1 on not using a chambered muffler on turbo vehicles. Chambered mufflers do not allow the same amount of exhaust velocity as a straight-through, perforated tube type muffler. I plan on fabbing up a true dual before the stock y-pipe, and using a Magnaflow 3" dual-in, dual-out.

If you're not happy, tell them to replace the muffler, plain and simple. I don't quite understand, is it twin 2.5" piping the entire way from engine to tip? If so, that will flow more than a single 3", and actually as much as a 3.5" single. I would agree though, that dual 3" would still be beneficial, and flow slightly more than a single 4".

Looking at the Dynomax website, it looks like the super turbo isn't a straight-through design, but not chambered either, it's a triple pass? Honestly, I agree with you that you do not need much muffling for this truck, just enough to reduce the drone or raspiness.

5ohxlt

^^just a picture i found trying to illustrate the set up i had in my 03 ram and 06 f150, and what i will probably do on my 2012. the only difference between what that picture and what i had is mine was a H rather than a X and had mac mufflers which are square and obviously the pipes were longer lol.

Tmmyby

I had no idea what this was for. I was thinking it almost looks long enough for a SMART car. Ha

ndnJedi

On my 07 6.0 Powerstroke I got one of these mufflers, specifically 21470. Cost $68 through Napa Canada. I read that it is maybe $40-55 in the US.

Almost all listed are aluminized, some are stainless, but all depends on style and size.

This is listed by inlet size, 2.5" starts on page 10 and Style 1 is a straight through muffler. If I had known about this PDF before installing, I would have gotten a shorter overall length muffler.

http://www.walkerheavyduty.com/catal..._InletSize.pdf

PlaTTinum

Pulled me out of lurking. I did this setup myself a few months ago, relevant thread is here
https://www.f150forum.com/f70/ecoboost-x-pipe-h-pipe-dual-exhaust-147085/

I chose to go Magnaflows, as they're straight through, as well as some resonators. There's close to no drone on highway, but I'm surprised how much it really opens up when you stomp on it. Your shop is probably right on the piping. It's 2.5" through the cats, and then turns into a single 3" pipe at the Y. If you do the math, a single 3" pipe is less area than dual 2.5", so you're freeing up restriction by doing this. Any larger would be a waste in my opinion, unless you're go for larger cats/remove them.

snake2472

Just a quick report back:

Got my truck back this afternoon after spending the day at the muffler shop to switch out the Dynomax Super Turbo with another Dynomax model which is the Ultra Flow. Aside from the fact that the latter is stainless steel, it's also a true straight through muffler compared to the Super Turbo where e airflow snakes thru the muffler housing; it may not be chambered but it's also not a true straight through muffler.

First Impressions:
Upon start up I get that low tone rumble nothing scandalous but just enought to let me know and other people know " Hey I'm a truck"... I consider it a deep rumble. Once the rpm settles just above 500rpm - the rumble lowers.

Peeling off: I get that mid level rumble, still solid sounding but still not scandalous like "hey look at me" but once the gear and the rpm settles - I would say 70% of the sound is unnoticeable.

Regular Driving: There is some drone which to me is tolerable. What do I consider tolerable? When I turn the radio on (without blazing the speakers) I barely hear the drone or when engaged is a conversation I barely hear it.

Caveat: this feedback is based on a 20+\- ride after the change up.

Conclusion: IMO I found the set up that I was looking for. I did a good amount of reading here mainly and then some at other sites including manufacturers websites. I also spent a lot of time viewing and listening to different sound bytes on you tube etc. it has a deep rumble on start up but as the EB works on low rpm - the sound and drone goes away until you mash the pedal again. I wouldn't say it's the best, but the best for what I was looking for.

Setup: true twin exhaust catback with Dynomax Ultraflow and 2.5" piping bent behind the rear tires.