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I Hate My Mufflers


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My recently acquired 73 Q code has a relatively mild build with ten year old Flowmaster 40's that are too darn noisy. What I want is quiet whilst free flowing as the current Cleveland will be replaced with a 427 Windsor a bit down the road. This is a 2 1/2" system with long tube headers. Suggestions?

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Two things I know about mufflers, one is that stainless steel mufflers tend to be made out of thinner material because stainless steel is stronger than regular steel so it can be thinner, right? Well, thinner material transfers noise better and stainless is a little harder so that helps transfer noise, too. Tends to be a little tinny since they don't absorb as much of the higher frequency noise.

The other is size. Comparable, but bigger mufflers are quieter.

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Thrush Turbos Maybe?

 

These are mellow sounding and not raspy as I remember.

 

Check some Youtube vids.

 

http://www.summitracing.com/parts/wlk-17656?seid=srese1&gclid=CL2Z5Zi99MICFRJlfgodBnQAkQ

73 Grande

351C 2v

Now 4v Carb/Cam/headers/T5

 

Gasoline is for washing parts.

Alcohol is for drinking.

Nitomethane is for racing!

 

 

Work in Progress photos here:

Last Update: 4/23/16

 

http://s1270.photobucket.com/user/therocket366/library/?sort=3&page=1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Have you thought about insulating the interior a little more? Unfortunately having free flowing mufflers with little noise is probably going to be hard to accomplish. I insulated the interior of my car and I still hear the exhaust but not to the point that it's annoying. Lots of different insulation material is available to work with. Good luck.

-john

(jbojo)

351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,

C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

 

Some Mod pictures can be seen at: [button=http://www.7173mustangs.com/forum-garage?filterxt_uid=2026]Bojo's Garage[/button]

 

 

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I have magnaflows on a 2.5" system with an x-pipe and Herman shorty headers running out of my 302, sounds awesome and I would recommend them to everyone. The other mufflers I like are spintech

1_12_09_14_10_32_45.png

 

- Nik

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.

unfortunately there is no such thing as free flowing and quiet so you need to pick one or the other . . the thrush turbos rockett366 mentioned are good and the dual wall stainless dynomax are good . . you can add resonators if they are too loud . . if you want the quietest mufflers possible buy walkers.

.

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Dynomax Super Turbo mufflers flow well and are much quieter than the Flowmasters.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.

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Dynomax Super Turbo mufflers flow well and are much quieter than the Flowmasters.

 

Agreed. A couple years ago I had some SS Magnaflow, but within 1 year (less than 600 miles) they became very loud. Summit gave me a full refund credit for them with which I purchased the Dynomax. Better, but not as quiet as I was hoping. Unfortunately, we are limited in size if you want to tuck them up and away.

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Here's what I did after much research on here and forum exchanges:

 

Hooker Competition headers and collectors; Pypes 2.5" stainless steel Street Pro w/X-pipes exhaust system with Violator mufflers; 3.5" MBRP dual wall polished stainless steel tips. It is a little bit more expensive but should last almost forever and it really gives me the sound I was looking for. It's not real loud which is very important in a 'vert but yet gives me that muscle car sound when I step on it. I get compliments on the nice muscle car rumble all the time. The pieces all fit together really well. I only needed one slight bend where you connect it at the collectors. I did have a shop put it in since I didn't have the exact tools. They were so impressed with the fit and sound compared to other systems they deal with that they are going to start recommending it. Maybe not for everyone but wanted to share.

 

Cheers and Good Luck!

 

220190877_photo3(1).JPG.5777cac09f14bc1624000490d596a787.JPG

JHawk

J-Hawk-1-1.jpg

JHawk's Garage

 

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Jhawk, did you use the gasket that came with the hooker headers or some aluminum or copper ones?

 

1971 M-code Mach 1

20160929_171923_edit2_small.jpg

 

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

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Jhawk, did you use the gasket that came with the hooker headers or some aluminum or copper ones?

 

1971 M-code Mach 1

 

Hey Tony, I just used what came with them. I also used the Stage 8 Header Bolts to prevent the bolts from backing off.

 

JHawk

JHawk

J-Hawk-1-1.jpg

JHawk's Garage

 

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How long have you had the headers installed? I assume no issues, right?

 

1971 M-code Mach 1

20160929_171923_edit2_small.jpg

 

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

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How long have you had the headers installed? I assume no issues, right?

 

1971 M-code Mach 1

 

Almost a year now and no issues. To be honest I never even thought about using any other kind of a gasket. From what I understand the Stage 8 Header Bolts really are the difference maker and so far so good!

 

JHawk

JHawk

J-Hawk-1-1.jpg

JHawk's Garage

 

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Here's what I did after much research on here and forum exchanges:

 

Hooker Competition headers and collectors; Pypes 2.5" stainless steel Street Pro w/X-pipes exhaust system with Violator mufflers; 3.5" MBRP dual wall polished stainless steel tips. It is a little bit more expensive but should last almost forever and it really gives me the sound I was looking for. It's not real loud which is very important in a 'vert but yet gives me that muscle car sound when I step on it. I get compliments on the nice muscle car rumble all the time. The pieces all fit together really well. I only needed one slight bend where you connect it at the collectors. I did have a shop put it in since I didn't have the exact tools. They were so impressed with the fit and sound compared to other systems they deal with that they are going to start recommending it. Maybe not for everyone but wanted to share.

 

Cheers and Good Luck!

 

 

+1

I got the same system and I really like them. Not really loud in my opinion.

-john

(jbojo)

351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,

C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

 

Some Mod pictures can be seen at: [button=http://www.7173mustangs.com/forum-garage?filterxt_uid=2026]Bojo's Garage[/button]

 

 

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I gladly replaced the Flowmaster 2 chamber catback with the Dynomax Super Turbo kit on my stock 4-cat equipped 5.0.

The Flowmasters were literally deafening in the car's interior, even in a convertible.

I've since learned that resonance (especially @2k RPM) is independent of sound output. Yeah, the Flowmasters sounded OK out of the pipe, but the tradeoff was in no way acceptable to me.

 

+1 for the Dynomax, but everybody's expectations are different. Your mileage may vary.

Pete - MotoArts Decals and Signs

'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...

'90 Mustang 7-Up 5.0 ragtop, rolling beater - SOLD

'66 Sunbeam Tiger Mk.IA, survivor

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My magnaflows are too fricken loud. I asked for quiet mufflers and they told me these would be great. Removed the Flowmasters and installed these and I have to say that because of my gearing and highway driving my car is always louder than I want it. I have been told my car sounds great from those outside but I am in the car and near deaf because of them. I regret changing to these because they did not solve the noise problem and I also believe they introduce some vibration through the harmonics as well. I have dynamat throughout my car and it is still too loud. Don't let anyone tell you they are quiet because that is simply untrue. I have cams, and longtube headers and that may contribute to the excessive noise.

Bright lime 72 Mach 1 with 351C 4V, with summit 600 carb(have a Holley too), Edelbrock dual-plane manifold, Hooker headers, 3 inch exhaust with flowmasters, 17 inch Eleanor wheels, FMX tranny, A/C, P/S, front disks and 350 rear gear. Drive it to work every day.

 

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What sort of hangers are you guys using? The fabric strap kind always seem to be too stiff and likely to transmit vibration and resonance into the unibody. What about converting to rubber hangers like on newer cars?

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I had the same problem when I installed the new dual exhaust system on my 71 Mach 1, 351C. I was shocked how loud the turbo mufflers were that came with the kit. I instantly realized that the freshly restored car would never pass technical inspection with those things when applying for registration.

I read a little bit on the web and decided to try it with a pair of Walker 17190 SoundFX mufflers. I ordered them from Rockauto for $40 each.

The car passed inspection and is registered for traffic now, they sound nice and powerful and the car drives with a very acceptable sound level inside when on the road.

 

A slight modification to the center pipes is neccessary because the Walker mufflers are a little longer than the mufflers from the exhaust kit, which I think is from Scott Drake. Approximately 2 inches have to be cut off the pipes to make the mufflers fit. Input/output dia is 2 1/4".

 

My car also has a very good soundproofing with Dynamat and additional textile sound dampening material.

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Quiet + high flow => Walker RV mufflers (recreational vehicle,i.e. camper for our international readers). These will quiet down a Ford 460.

 

Mild rumble + high flow => double walled Dynomax.

 

I've used the Dynomax in the 65 vert (351w at the time) and thought that there wasn't enough rumble. Now that I'm a bit older a little mild rumble is better IMHO and the Dynomax mufflers are perfect.

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after reading about all the problems caused by Flowmaster for years on various forums, i went with Turbo mufflers.

i'm pretty happy with them, they are only really loud when i stomp on it.

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Appreciate the replies gents.

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2.5" Thrush Sonic Turbos on my 429 & it's much quieter than I expected it to be. They are compact but do the job, at a very low price.

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I considered the 40 series Flowmasters for my 351 C but I decided they were way too loud on other cars I heard. I installed Flowmaster 50 series 2 1/2" inlet 2 1/2" outlet. Aggressive sound but they are quiet enough to cruise comfortably.

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