Max muffler size? Or... what muffler for 50% loudness - Page 2 - Ford Bronco Forum
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post #21 of 48 (permalink) Old 06-08-2019, 06:15 PM Thread Starter
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Thankfully I have almost a year to consider header choices.
I'll definitely do some research on shorty vs long-tube
Thanks for the heads-up!

Quote:
Originally Posted by CZ Eddie View Post
So until next year when I do a stroker build... I'd be looking at...
3.0" single tube cat-back, rear cat delete, front cat hollowed out and larger 4.10 or 4.27 gearing.
So this is still the plan for right now.
But the 3" cat-back will really just be me buying a muffler and going to a shop to have them do the 3" pipe work from cat-back.
I don't want or need stainless, since this is Central Texas and I don't have to worry about rust anytime soon.
That, and I prefer to have a single side-exit that doesn't look shiny.
I would only want shiny if I had dual rear exhaust, which I'll never have since my dogs will be spending a lot of time in the rear hatch area (don't want fumes back there).

That Flowmaster 50 seems to be a winner.
I love the way it sounds.
A bit louder than I wanted, but it's so beautiful that I want it anyways.

Some videos I found with sound of the Flowmaster 50 + our 351W.
All but one are Broncos, with the 4th being a 90's F150 351W:




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post #22 of 48 (permalink) Old 06-08-2019, 06:17 PM Thread Starter
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With a stock engine/everything, is 3" really the way to go vs. a 2.5"?
I know too large an exhaust pipe can be great for top end while robbing the bottom end.
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post #23 of 48 (permalink) Old 06-08-2019, 08:09 PM
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You wont notice a difference, the myth off back pressure is one that is not understood by many, its actually called scavenging and involves the principle of the exhaust flow actually pulling more exhaust out with it based on the areas that create a vortex and help pull more exhaust out. Theres more that goes into it than just pipe diameter, but basically with a 3” single pipe you can support 200-300 hp easy. Think about it, if “back pressure” was a thing than youd see low torque numbers on a engine dyno where the engines are ran with open manifolds/headers. Too large off a pipe can effect scavenging which will affect the engines efficiency to remove the exhaust gases, the quicker and most effectively the exhaust gases can exit the quicker fresh air that can be brought in for a optimally efficient engine. Its a balance, you need a big enough pipe to get the flow but one sized properly for the engine.

Add a punisher valve body with that exhaust and youll will notice a huge drivability improvement
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post #24 of 48 (permalink) Old 06-08-2019, 08:16 PM Thread Starter
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Ya'll are pushing punisher valve body pretty hard in this thread.
Doesn't that just firm-up the shifts?
I like the way my tranny shifts right now, not sure that I want to mess with it.
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post #25 of 48 (permalink) Old 06-08-2019, 08:25 PM
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Makes the shifts quicker and smoother, paul from punisher valve bodies can adjust the firmness of the shifts to suit your need, he’s well know for his lightning valve bodies, since the lightnings have a 4R100 which is basically the updated later version of the E4OD he deff knows what he’s doing. Quite a few of us on here are running them. With one you will see quicker shifts with less lag. He also addresses a few common problem prone areas in the valve body. [email protected] is paul’s email dont hesitate to ask him questions.

Heres my review on it

https://www.fullsizebronco.com/forum...dy-review.html
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post #26 of 48 (permalink) Old 06-08-2019, 08:33 PM
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that 50 series flowmaster sounds very mild compared to the bassani
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post #27 of 48 (permalink) Old 06-09-2019, 03:36 AM
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I used a magnaflow 12641 on mine. its a 3" in/3" single out 6" round muffler with a 30" case and a 36" overall length. it connects directly to my bassani y pipe(without the extension pipe) and then directly to the tailpipe that exits in the stock location. I dont think you can get a much larger muffler underneath a bronco

https://www.jegs.com/i/Magnaflow/642/12641/10002/-1
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post #28 of 48 (permalink) Old 06-09-2019, 05:04 AM
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Also your not limited by only round mufflers, i have a oval muffler on mine that is 4x9x14. Its a little tighter than the round muffler


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post #29 of 48 (permalink) Old 06-09-2019, 10:11 AM
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Agree on the oval, or even some square case ones out there. Get it right and will not be below the frame rail.

Agree on the back pressure comments.
Also on the pipe diameter you can get it so large that the pipe and gases cool inside too quickly. This will slow down the flow if it gets cool enough, and the hot charge at the front will in a way pack up behind the cooler exhaust at the end, Effecting the scavenging. 3" seems to be a good size on these Broncos for most combos, especially normal bolt on style builds.

I think the big thing people miss is not looking at the whole thing as a system, They all work together to make your truck/bronco run the way it will run. If there is a piece that does not match to rest, it will not work the best it can, as a whole. Sometimes this gets bad enough that there is drive ability issues other times you may just spend more then actually needed on the "cool" parts. (Not saying I am not guilty of that myself)
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post #30 of 48 (permalink) Old 06-12-2019, 09:40 PM Thread Starter
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Thanks again, everyone. I'm pretty much settled on the Flowmaster 53055 Super 50 muffer with 3" in/3" out.
It's the centered pipe.
Is that cool or will the muffler shop who does the cat-back piping for me prefer an exit pipe offset/at the bottom of the muffler?

https://www.amazon.com/gp/product/B0...030F1X90&psc=1
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post #31 of 48 (permalink) Old 06-13-2019, 12:18 AM
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Quote:
Originally Posted by CZ Eddie View Post
Thanks again, everyone. I'm pretty much settled on the Flowmaster 53055 Super 50 muffer with 3" in/3" out.

It's the centered pipe.

Is that cool or will the muffler shop who does the cat-back piping for me prefer an exit pipe offset/at the bottom of the muffler?



https://www.amazon.com/gp/product/B0...030F1X90&psc=1
When I got my exhaust done I chose the same center-in/center-out and a side-dump in front of front leaf spring perch, when the muffler shop I used to work at recommended an either an offset-in/center-out or offset-in/offset-out (I can't remember which). The muffler you chose may have shock-clearance issues if you're going up and over the rear axle. This is what my 5.0 setup looks like leveled (relatively) in each direction:


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post #32 of 48 (permalink) Old 06-13-2019, 10:24 AM
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i am not a fan of flowmaster stuff at all. magnaflow/dynomax/ap etc... are much better mufflers performance wise.
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post #33 of 48 (permalink) Old 06-13-2019, 03:00 PM
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Our Stock engines are not Hi rpm screamers moving a lot of air in and out the exhaust. As long as there are no problems inside a muffler and the Pipe size of the muffler is 2.5" in and out or larger 3" in and out, you don't really need to worry about muffler flow rates (within reason that is). Just find a muffler that has the sound you want and go for it. 3" Diameter all the way thru is more than enough for a Stock and slightly warmed up engine, also (2) 2.25" dia pipes flow more than 1 3" dia pipe, just an fyi.. The larger the Dia piping the lower the pitch/sound of the exhaust will be and vis versa. Just get a good flowing Y-pipe and a good flowing Cat, then have at it whatever floats your boat..... The more HP the more flow you need.
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post #34 of 48 (permalink) Old 06-15-2019, 12:59 PM
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Based on HP for pipe size, the bigger the chamber the quieter and more torque. I have put reducers on mufflers and cats then installed them on smaller pipes for more flow many times. Pipe size is more relative than chamber size.
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post #35 of 48 (permalink) Old 06-20-2019, 01:37 AM Thread Starter
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He couldn't do it right then.
But the muffler shop I went to quoted me $280 to do a y-pipe from the downpipes then 3" in'n'out to the Flowmaster I bought, to a single-side 3" right side exit at the stock location.
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post #36 of 48 (permalink) Old 06-20-2019, 12:03 PM
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Any reason you prefer not to buy the Magnaflow 93312 Y-pipe? I have it on my '93 and it is perfect. It comes with the cat and, if not using, you can sell it like I did and recoup almost half of your cost!

Just curious on your y-pipe preference?

Magnaflow #93312 Y-Pipe

MagnaFlow Direct-Fit Catalytic Converters 93312

https://www.summitracing.com/parts/mpe-93312

*cost varies via internet so cheaper prices may exist

Specs.:

Brand:MagnaFlow
Manufacturer's Part Number:93312
Part Type:Catalytic Converters
Product Line:MagnaFlow Direct-Fit Catalytic Converters
Summit Racing Part Number:MPE-93312

UPC:841380011381
Inlet Diameter (in): 2.500 in.
Outlet Diameter (in): 2.500 in.
AIR Tube: Yes
Converter Case Material: Stainless steel
Converter Substrate Material: Ceramic honeycomb
Heat Shield: Yes
Converter Overall Length (in): 55.200 in.
Converter Overall Width (in): 7.000 in.
Converter Style: 3-way with oxidation
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post #37 of 48 (permalink) Old 06-20-2019, 03:57 PM Thread Starter
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Quote:
Originally Posted by csilvestri View Post
Any reason you prefer not to buy the Magnaflow 93312 Y-pipe? I have it on my '93 and it is perfect.
That one is $210 less than the one Magnaflow advertises for the 1994 Bronco 5.8L.
But now that I think about it, I guess the only difference is just that yours has a single cat while the more expensive 1994 version has two cats.

Thanks for the heads up!
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post #38 of 48 (permalink) Old 06-20-2019, 04:04 PM Thread Starter
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@csilvestri did it come with the 02 sensor mounting?
Looks like it does in the pix but one review said they had to have an 02 mount welded in.
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post #39 of 48 (permalink) Old 06-20-2019, 07:45 PM
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The 93312 is cheaper, has 1 cat and 1 O2 bung at the convergence of the Y in the pipe. The 23661 is more expensive, comes with 2 Cats 1 integral to the Y-Pipe and 2 O2 bungs in each down pipe.
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post #40 of 48 (permalink) Old 06-20-2019, 08:47 PM
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Quote:
Originally Posted by CZ Eddie View Post
@csilvestri did it come with the 02 sensor mounting?
Looks like it does in the pix but one review said they had to have an 02 mount welded in.
Yes, mine is exactly like the one in the diagram rendering above. A picture of my actual install is below. A single O2 bung in the center merge "Y" area. Quality was top notch and I've had zero issues.
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