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post #1 of 19 (permalink) Old 09-25-2017, 05:27 PM Thread Starter
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Need new mufflers

My '64 TBird build is on it's third year and it's high time to deal with my muffler issue.

The engine has been built with the OE heads, 9.7 compression, mild hydraulic roller cam. I have Sanderson shorty headers and an excellent 2-1/2" custom exhaust with H pipe. I'd guess she's making 350 HP.

Unfortunately, I purchased a used pair of mufflers from a "friend". They are Magnaflos, 14" long, 9-3/5" wide, and 4" deep. The inlets and outlets are offset, same side. I looked in their catalog- no longer made. These are mounted just ahead of the axle.

They are way too loud. The drone in the heavily insulated cabin drove me nuts.

Last year I had my muffler guy add on a pair of Hushpower mufflers just ahead of the exits, in the locations where the factory resonators go. Not cheap, but it made a huge improvement.

However the drone at highway cruise continues to bother my wife, so I need to quiet things down another notch. The car has a 3.00:1 rear end so at 65 mph the engine is turning just shy of 2500 rpm. At lower speeds it's OK but we do a lot of highway driving.

In the interest of doing as little adjustment as possible to my otherwise excellent exhaust system I was hoping to find the same size muffler and inlet-outlet configuration. Fat chance. After an extensive search all I found was a Flowmaster 842554, and they have been discontinued. Using Flowmaster's site for a similar car and engine, they recommend using an offset inlet and center exit in that same series, and those are fairly common.

I can go as long as 16", maybe 17", in the current space.

Engine Masters has a video where they dyno 4 mufflers including the Flowmaster and it gets beat in lower RPMs (which is where I'll be using it) significantly by the Borla Pro XS, So I'm leaning towards that.

Good reviews on the Borla, most are saying that it is quiet at 2000 RPM, which is where more modern cars cruise at. So that's a bit of concern to me, will it start to drone at 2500?

Other mufflers in this size/ configuration, stainless steel, available by Summit:

Hooker VR
Dynomax Ultraflo
Gibson (reviewers say they are loud)
Pypes Street Pro (had them on another car- terrible drone!)
AP Xlerator
Jones Exhaust Max (super cheap, good reviews)

Constructive thoughts on this modification will be appreciated.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #2 of 19 (permalink) Old 09-25-2017, 06:09 PM
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Re: Need new mufflers

i use to love FlowMaster mufflers..
but as im getting a litter older, i can not stand them any more..
the drone starts to make nuts after a ten min drive...

i now have switched over to the Thrush Hush super turbo mufflers
on both my 64 Galaxie and 57 bel air
i love them nice and quiet in car (no drone)
but still has a nice mellow blurb at tail pipe, without offending the neighbors

https://www.summitracing.com/parts/wlk-17633/overview/
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%201964%20Galaxie/?action=view&current=09-03-10_1408.jpg Lars...
64 galaxie 500 2dr fastback...390 4v, Bendtsen adapter, maddog's stage3 700R4 trans,3.70 Posi..far from perfect but getting there...
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post #3 of 19 (permalink) Old 09-26-2017, 12:15 PM Thread Starter
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Re: Need new mufflers

I was leaning towards Borla and then I found this article, dated but lots of info. Ford Mustang Muffler Comparison Test - 5.0 Mustang & Super Fords Magazine

The Borla XS has the highest low end torque and lowest sound volume at all three points reported. On order from Summit, as they had the best site to help me compare fitment.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #4 of 19 (permalink) Old 09-27-2017, 04:54 AM
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Re: Need new mufflers

I run Borla ProXS on my Mustang and love them, replaced 50 series Deltaflow Flowmasters. No drone, good bark when you are in it, downside is price. On my F100, I run the Jones, absolutely love them, quieter than the Borla and way cheaper, very similar design. I would lean toward Jones, but Borla was my go-to muffler prior to that, so no problem with that choice either
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post #5 of 19 (permalink) Old 09-27-2017, 05:30 AM Thread Starter
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Re: Need new mufflers

How does the Borla compare to the Flowmaster 50 for sound?

Summit lists the Jones Exhaust Max for $36. I've never been one to equate quality with price, but that seems too cheap. How can they make them without using inferior materials and Chinese vendors?

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #6 of 19 (permalink) Old 09-27-2017, 03:15 PM
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Re: Need new mufflers

I just have stock style replacement mufflers and they are nice and quite on the highway and I think they sound nice when standing behind the car. What about the mufflers with the internal valve, I think Dynomax makes one? It has a spring loaded baffle that opens up to a straight through muffler under heavy throttle and a baffled muffler under light throttle conditions. If those work as advertised they might be a good option.
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670 Street Avenger, Edlebrock Performer intake, Comp XE262H, Flowtech Headers
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post #8 of 19 (permalink) Old 09-28-2017, 06:22 AM Thread Starter
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Re: Need new mufflers

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Originally Posted by 70XL View Post
I just have stock style replacement mufflers and they are nice and quite on the highway and I think they sound nice when standing behind the car. What about the mufflers with the internal valve, I think Dynomax makes one? It has a spring loaded baffle that opens up to a straight through muffler under heavy throttle and a baffled muffler under light throttle conditions. If those work as advertised they might be a good option.
I was considering OE type mufflers, but everything else has been mild performance oriented (cam, intake, headers, 2-1/2" exhaust) so I want to compliment that.

I've heard about the valved mufflers. There is also a model that can be "tuned" by turning a bolt on the end cap. Under the conditions that a muffler operates, I don't see that stuff working properly after a few months. Even muffler clamp bolts freeze up.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #9 of 19 (permalink) Old 09-28-2017, 06:23 AM Thread Starter
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Re: Need new mufflers

My427stang Thanks for that- very informative. Great documentation.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #10 of 19 (permalink) Old 09-28-2017, 09:44 AM
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Re: Need new mufflers

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Originally Posted by Yadkin View Post
I was considering OE type mufflers, but everything else has been mild performance oriented (cam, intake, headers, 2-1/2" exhaust) so I want to compliment that.
My engine build is mild, as well, as you can see from the info in my sig. I just kept the mufflers I had there from before the engine rebuild, the headers and crossover, "H", were new. I'm sure I wouldn't feel any difference in performance on the street If I installed Magnaflows, or the like, but I think I would hear the difference. On the highway there is enough wind and road noise to drown out, mask, the exhaust, so I don't have a sense how much louder I could take it before it became annoying.

1970 XL, 351W originally 2V, now 4V
670 Street Avenger, Edlebrock Performer intake, Comp XE262H, Flowtech Headers
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post #11 of 19 (permalink) Old 09-28-2017, 04:04 PM
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Re: Need new mufflers

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Originally Posted by 70XL View Post
On the highway there is enough wind and road noise to drown out, mask, the exhaust, so I don't have a sense how much louder I could take it before it became annoying.
trust me.... a set of FlowMaster and you would not be aware of any wind or road noise....
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post #12 of 19 (permalink) Old 09-29-2017, 05:34 AM Thread Starter
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Re: Need new mufflers

The new muffs appeared at my doorstep yesterday. Lightning fast shipping from Summit's GA warehouse.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #13 of 19 (permalink) Old 10-05-2017, 09:18 AM Thread Starter
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Re: Need new mufflers

Had my local guy install them. He put them on "backwards" with center inlet/ side outlet. Borla approves this method, but I was apprehensive.

Idle sound is quiet but awesome. On the throttle and sound level is less but still enough to let the neighbors know you are there. Nice throaty tone- far sexier than the Magnaflows.

The big surprise was on the highway. Cruising at 80, RPMs up to just below 3000, and she's quiet like a mouse. No more drone, and I can use this car for long trips as God intended.
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post #14 of 19 (permalink) Old 10-05-2017, 02:59 PM
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Re: Need new mufflers

Which mufflers did you end up getting?

1965 Ranchero Deluxe 66B
Factory 289 4-speed
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post #15 of 19 (permalink) Old 10-05-2017, 04:42 PM Thread Starter
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Re: Need new mufflers

Borla Pro XS 40358.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.

Last edited by Yadkin; 10-05-2017 at 04:52 PM.
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