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Hey everyone, after 65k+ my summit knockoff magnaflow blew all the packing out, and was starting to rust through.
A few months ago, I did a resonator delete, and when I saw the muffler starting to rust out, I decided to swap the exhaust and run a side exit in front of the pass side rear wheel, and basically the system now has a 3 pipe off the cats, 3 inlet and outlet Thrush welded 3 chambered muffler, 45 degree bend, and 20 degree bend, and about 2 feet of pipe.
all 3 pipe from the front flange out the back.
is the chambered muffler going to be an issue? I noticed at full throttle when Im driving next to a wall or guardrail, it makes a loud whoosh and the rasp of the muffler and at all other load and rpm it sounds normal.
am I choking my truck? Will I cause damage or have turbo issues?
You are better off with a straight through design. Even the stock system is straight through. When you add chambers and barriers for the exhaust gas to go around you create back pressure. Back pressure is not something you want with turbos.
You are better off with a straight through design. Even the stock system is straight through. When you add chambers and barriers for the exhaust gas to go around you create back pressure. Back pressure is not something you want with turbos.
stock wasnt straight through, it was a huge turbo muffler- I cut the original muffler out at about 20k miles and could clearly see the turbo style overlapping pipes and barriers.
maybe a super turbo muffler would be better? With the turning vanes in it?
I put the K&N Cat Back on my Eco Boost Truck with the Vibrant Ultra Quite Resonator $600.00 without tax for both and they're both the good 304 Stainless material!!I'm sure you don't want to spend that much money but thought i would post pictures!!
Last edited by Mark Miller; Dec 31, 2020 at 03:15 AM.
stock wasnt straight through, it was a huge turbo muffler- I cut the original muffler out at about 20k miles and could clearly see the turbo style overlapping pipes and barriers.
maybe a super turbo muffler would be better? With the turning vanes in it?
not saying you didn't see what you saw but very stock muffler thread ends up with this picture of a stock muffler. I know the stock exhaust on my 2019 5.0 is straight through.
That muffler may be from an old eco boost, what I have seen in the newer ones, the 2.7L, 3.5L, and 5.0L all had the same muffler. When I looked at my factory one after I cut it off, it looked like a flowtech afeterburner, but much larger. Basically, a 3 pipe entered the muffler to about 1/3 the distance of the muffler, and stopped at a wall like a chamber. Then the center section LOOKED empty but could have had something in it, then the last 3rd had another wall, and the 3 outlet, I think both piper were perforated too inside the chambers. This pic shows the spot welded from the walls which kind of supported my theory on it being a large turbo muffler
Come to think of it, and looking at more pics of take-off exhausts, my original muffler may have had three spot welded sections in it, but it was offset inlet and offset outlet, I still thought it may be a turbo muffler, but all that aside, is a chambered muffler only going to sound weird or will it cause damage to the turbos or maybe only lose a little power?
That muffler may be from an old eco boost, what I have seen in the newer ones, the 2.7L, 3.5L, and 5.0L all had the same muffler. When I looked at my factory one after I cut it off, it looked like a flowtech afeterburner, but much larger. Basically, a 3 pipe entered the muffler to about 1/3 the distance of the muffler, and stopped at a wall like a chamber. Then the center section LOOKED empty but could have had something in it, then the last 3rd had another wall, and the 3 outlet, I think both piper were perforated too inside the chambers. This pic shows the spot welded from the walls which kind of supported my theory on it being a large turbo muffler
that is very interesting. My 2018 2.7l muffler did not have those spot welds. It looked identical to my 2019 5.0 stock muffler. Either way, a straight through muffler will have less back pressure than a chambered muffler. You don't want back pressure with turbos or NA for that matter but especiallywith turbos. I'm not an expert but I would imagine it will cost you some power with a chambered muffler compared to a straight through design.
that is very interesting. My 2018 2.7l muffler did not have those spot welds. It looked identical to my 2019 5.0 stock muffler. Either way, a straight through muffler will have less back pressure than a chambered muffler. You don't want back pressure with turbos or NA for that matter but especiallywith turbos. I'm not an expert but I would imagine it will cost you some power with a chambered muffler compared to a straight through design.
It was years ago I cut mine out, so I really don't recall 100% - I agree straight through is better, I was trying to reduce noise a tiny bit as I went side exit... But the chambered muffler sounds like a hair dryer at full throttle under load- just air... I don't like it one bit, but at every other rpm it sounds pretty good. I have seen a lot of super turbo's on Ecoboost on youtube that don't sound bad - I may go that route... Luckily I have an understanding wife, and I'm only wasting $35 or so replacing the thrush welded muffler...
If i were you, I'd probably go 304 stainless 3" pipe all the way and put the biggest Borla or Magnaflow muffler I can find. If that still doesn't give you the sound and you want to make it quieter, throw on a resonator at the mid pipe. Those Ecoboost motors are extremely hard to make sound good. It's just the nature of the beast.
Flowmaster or Thrush Welded bad for Ecoboost?
