What's the quietest 3.5in?

Montoya · May 6, 2021

I'm finally driving my Bronco and it's simply too loud. I have to wear earplugs or my ears ring for hours after driving.

Quick background on the setup:
Engine is a 427ci Windsor based with a very aggressive cam and full stand alone ecu.

I have the Bronco Hut 1-5/8" primary shorties and I made everything after that. After the headers I'm running 2.5in OD tubing that merges into a single 3.5in out to the back. I have a single 3.5in Flowmaster muffler on the end but it's just not enough.

I'm thinking of adding an inline resonator or a better muffler? Looking for any advice. I did some searching but not sure how many have a setup like this. Maybe Scoop has some ideas?

Thanks for any help.

txtruk15 · May 6, 2021

I've got shorties, nothing like the powerplant you have. But switching from the flowmaster to a magnaflow certainly quieted things down a bit....

Bronco-Brian · May 6, 2021

Hey, wanted to share a good dyno test using muffler types. Check out Engine Masters from motortrend. Search muffler shootout - might learn a brand that meets your hp and noise requirements. I think some of their shows are on you tube also. Worth a shot.

76YETI · May 6, 2021

I have the flowmaster 40's....I believe a lot of owners were happy with the flowmaster Delta 50's for a quiter sound but a nice rumble when you want it.

SteveL · May 6, 2021

After putting flowmasters on the 66 I wanted something quieter on the 72. I went with the borlas. Lower tone like an 80s mustang. I think they were a little shorter than the others and all stainless for durability. If we do the swap meet you can hear the difference.

jmhend · May 6, 2021

Montoya said:
I'm finally driving my Bronco and it's simply too loud. I have to wear earplugs or my ears ring for hours after driving.

Quick background on the setup:

Engine is a 427ci Windsor based with a very aggressive cam and full stand alone ecu.

I have the Bronco Hut 1-5/8" primary shorties and I made everything after that. After the headers I'm running 2.5in OD tubing that merges into a single 3.5in out to the back. I have a single 3.5in Flowmaster muffler on the end but it's just not enough.

I'm thinking of adding an inline resonator or a better muffler? Looking for any advice. I did some searching but not sure how many have a setup like this. Maybe Scoop has some ideas?

Thanks for any help.

I am running a Walker 41200 and I love it. It is a little long but it is super quite (to me that is).

Jason

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AZ73 · May 6, 2021

jmhend said:
I am running a Walker 41200 and I love it. It is a little long but it is super quite (to me that is).

Jason

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Walker quietflow 21400. They're built to flow 454 ci and they have 2 intakes and 1 output so you don't need the "Y" before the muffler.

Montoya · May 6, 2021

Thanks for the input guys. Unfortunately the series 50 flowmaster with 3.5" inlet is 22" long and that just won't fit. It's tight in the back where I have it currently mounted.

jmhend · May 6, 2021

Wow that is super tight. I have mine mounted between the transfer case and the fuel tank. Not sure what "quite" options are out there for limited space. Sorry.

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brewchief · May 6, 2021

Try calling spintech and see what they can build you, theres a 1200hp Larry Minor jeep that was at the dunes here in Michigan with a single muffler that met the sound check requirements. They can build custom to fit the space you have.

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Montoya · May 6, 2021

brewchief said:
Try calling spintech and see what they can build you, theres a 1200hp Larry Minor jeep that was at the dunes here in Michigan with a single muffler that met the sound check requirements. They can build custom to fit the space you have.

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This is awesome! Making the call tomorrow. Thanks for the reference.

Montoya · May 6, 2021

SteveL said:
If we do the swap meet you can hear the difference.

I'm in! Let me know what time you're leaving.

armynavy17 · May 8, 2021

For quite I would recommend an appropriately sized turbo muffler. Not sure if there's any hp or flow restrictions with them, but I kind of doubt it.

What's the quietest 3.5in?

Montoya

Sr. Member

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txtruk15

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Bronco-Brian

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76YETI

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SteveL

Huge chevy guy

jmhend

Bronco Guru

AZ73

Bronco Guru

Montoya

Sr. Member

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jmhend

Bronco Guru

brewchief

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Montoya

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Montoya

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armynavy17

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