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I am looking for something louder to replace my stock mufflers. I have a 73 vert with a 351 4V. I still want to be able to hear the radio and I don't want my neighbors to hate me. So something moderate will work. Any recommendation's would be appreciated. 

 

 

John J

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Maybe some Flowmaster 40s? :)

 

Some soundclips :)

https://m.youtube.com/watch?v=_lMjecjSILs

Daniel ::thumb::

 

Pro-Touring 1973 Mustang named ''Creator'' ... :P

Under construction!!

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I have Flowmaster 40's on my 351 4V and they sound great, get lots of good comments. Downside is droning at 2500 rpm that goes away at 3000. This is common on these cars, but my exhaust specialist claims that the Flowmaster's are the main cause. He recommends Dynomax saying they are about the same sound, but without the drone. I've not heard a set of them so I can't say for sure. Maybe he just wants to sell me a set as that is what he sells! I have to replace my old exhaust soon, so if anyone can confirm, I'm all ears.

Geoff.

Geoff.

 I learn something new every day!

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biggest glass packs you can fit. ;)

'Mike'

73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

 

Pics of modifications included in: [button=http://www.7173mustangs.com/thread-1973-convertible--3335]My Garage[/button]

 

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My car, a 73 Q Code Mach 1, came with Flowmaster 40's. The first "mod" I did was to toss them for Dynomax Super Turbo's. All is good now.

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I agree with Tommy, Dynomax super turbos. Because I like Dynomax I'm also considering the Dynomax VTs next time.

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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I have Flowmaster 40's on my 351 4V and they sound great, get lots of good comments. Downside is droning at 2500 rpm that goes away at 3000. This is common on these cars, but my exhaust specialist claims that the Flowmaster's are the main cause. He recommends Dynomax saying they are about the same sound, but without the drone. I've not heard a set of them so I can't say for sure. Maybe he just wants to sell me a set as that is what he sells! I have to replace my old exhaust soon, so if anyone can confirm, I'm all ears.

Geoff.

 

Mine drone Dynomax Super Turbos

2w6ugt2.png

Brad Smith

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I like these https://www.summitracing.com/parts/sum-631125/overview/ because they look period correct and sound good, louder than stock but not annoying. Chuck

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I like these https://www.summitracing.com/parts/sum-631125/overview/ because they look period correct and sound good, louder than stock but not annoying. Chuck

 

Those are the ones I'm running. Sounds decent and they don't drone on the highway but they may be a little more restrictive than some of the others out there.

73 Grande H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

 

- Jason

 

 

082-hot-rod-power-tour-2017-1970-1970s.jpg

 

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And then there are these:

http://www.xforceusa.com/products/varex-mufflers

 

Only $350 each...

 

Wonder if these or something similar are used in the GT 350's

-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 Flowmaster 40's on my 351 4V and they sound great, get lots of good comments. Downside is droning at 2500 rpm that goes away at 3000. This is common on these cars, but my exhaust specialist claims that the Flowmaster's are the main cause. He recommends Dynomax saying they are about the same sound, but without the drone. I've not heard a set of them so I can't say for sure. Maybe he just wants to sell me a set as that is what he sells! I have to replace my old exhaust soon, so if anyone can confirm, I'm all ears.

Geoff.

 

Mine drone Dynomax Super Turbos

 

 Interesting!

 The subject of drone has been gone over before. Some have tried resonators with differing results as I remember.

 So what is the cause of that annoying drone? Is it just the wave pulse traveling along the pipe? If so then a side branch resonator might be the answer, but where to put it as it's pretty tight under there.

It would be wonderful if a change to a better muffler would fix it. Perhaps some of you who have suggested other brands can comment on their experience with [eliminating] drone.

This is of particular interest to me as I'm very close to needing a new system also.

Geoff.

Geoff.

 I learn something new every day!

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On my 73 Q code vert I'm running Hooker Comp headers, 2 1/4 pipes H pipe and a pair of Summit brand Aero Chamber mufflers. No drone just a great real V8 sound and as the revs increase the sounds just keeps sounding better without being overly loud. I've had people ask what I'm using as the really like the sound. When I tell them they cant believe such a cheap and easy system sounds that good. I got onto these mufflers through a mate of mine when he needed some cheap mufflers on a car he bought in the US to drive around in. He ended up liking the sound so much they're still on the car today. They're a very well made piece and look just like the Hookers and quite a few people I know have been using them and are very happy with them    

These are the type we use, in fact my exhaust guy was so impressed with them and now uses them as well.     https://www.summitracing.com/int/parts/sum-630160/overview/

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On my 73 Q code vert I'm running Hooker Comp headers, 2 1/4 pipes H pipe and a pair of Summit brand Aero Chamber mufflers. No drone just a great real V8 sound and as the revs increase the sounds just keeps sounding better without being overly loud. I've had people ask what I'm using as the really like the sound. When I tell them they cant believe such a cheap and easy system sounds that good. I got onto these mufflers through a mate of mine when he needed some cheap mufflers on a car he bought in the US to drive around in. He ended up liking the sound so much they're still on the car today. They're a very well made piece and look just like the Hookers and quite a few people I know have been using them and are very happy with them    

These are the type we use, in fact my exhaust guy was so impressed with them and now uses them as well.     https://www.summitracing.com/int/parts/sum-630160/overview/

 

 NO DRONE!! Now That is very interesting and as you say cheap (ish). Nearly 40% on our Canadian dollar ups it a bit, but still worth considering.

Thanks for your input.

Geoff.

 I learn something new every day!

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Dynomax Super Turbo's

 

I agree. the DynoMax Turbos have all the breathing a hot street engine can dish out, but the car doesn't sound like an 18 year old owns it. I had my local muffler shop put a whole new exhaust system on my Mach 20 years ago, all stock, except for the mufflers, which were (are) the walker DynoMax Turbos. The entire system is still on and solid. It idles with a subtle deep tone and sounds smooth on the freeway with no drone. I drive the car everyday, and to me, it matters. If you only use your car as a Sunday ride, loudness won't matter.

    Just my opinion, Flowmasters are so "over done", noisy and tinny sounding.....just my .02 cents

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On my 73 Q code vert I'm running Hooker Comp headers, 2 1/4 pipes H pipe and a pair of Summit brand Aero Chamber mufflers. No drone just a great real V8 sound and as the revs increase the sounds just keeps sounding better without being overly loud. I've had people ask what I'm using as the really like the sound. When I tell them they cant believe such a cheap and easy system sounds that good. I got onto these mufflers through a mate of mine when he needed some cheap mufflers on a car he bought in the US to drive around in. He ended up liking the sound so much they're still on the car today. They're a very well made piece and look just like the Hookers and quite a few people I know have been using them and are very happy with them    

These are the type we use, in fact my exhaust guy was so impressed with them and now uses them as well.     https://www.summitracing.com/int/parts/sum-630160/overview/

 

 NO DRONE!! Now That is very interesting and as you say cheap (ish). Nearly 40% on our Canadian dollar ups it a bit, but still worth considering.

Thanks for your input.

 

None what so ever, then again I've always designed my systems to eliminate drone. The biggest problem is people put too big of a pipe on for their application. Most people don't want to believe what size pipe will handle X amount of power. The bigger is better thought transfers over to pipe diameters way too often. The amount of times I've seen twin 2 1/2" systems on 350 even 400+ HP engines then complain about drone is laughable. I've even met people that don't even realise what drone is as they think that's how it's just meant to sound. Nothing better than having the top down on the vert and hearing that proper V8 sound and tap the pedal,and it just sounds like a V8 should. The old mufflers were some Turbo thing as that's all it had stamped on it and sounded fairly good, but the aero chambers are something better again. 

As for exchange rates it's something I know all too well about for the last 25 years and on top of that the shipping costs to Australia aren't cheap either. Not much we can do about it but to just grin and bear it and either buy what you want or don't. Or there's always buy the same parts here from our stores and pay at the very least 20% more than bringing it in. It's a no brainer to me

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On my 73 Q code vert I'm running Hooker Comp headers, 2 1/4 pipes H pipe and a pair of Summit brand Aero Chamber mufflers. No drone just a great real V8 sound and as the revs increase the sounds just keeps sounding better without being overly loud. I've had people ask what I'm using as the really like the sound. When I tell them they cant believe such a cheap and easy system sounds that good. I got onto these mufflers through a mate of mine when he needed some cheap mufflers on a car he bought in the US to drive around in. He ended up liking the sound so much they're still on the car today. They're a very well made piece and look just like the Hookers and quite a few people I know have been using them and are very happy with them    

These are the type we use, in fact my exhaust guy was so impressed with them and now uses them as well.     https://www.summitracing.com/int/parts/sum-630160/overview/

 

 NO DRONE!! Now That is very interesting and as you say cheap (ish). Nearly 40% on our Canadian dollar ups it a bit, but still worth considering.

Thanks for your input.

 

None what so ever, then again I've always designed my systems to eliminate drone. The biggest problem is people put too big of a pipe on for their application. Most people don't want to believe what size pipe will handle X amount of power. The bigger is better thought transfers over to pipe diameters way too often. The amount of times I've seen twin 2 1/2" systems on 350 even 400+ HP engines then complain about drone is laughable. I've even met people that don't even realise what drone is as they think that's how it's just meant to sound. Nothing better than having the top down on the vert and hearing that proper V8 sound and tap the pedal,and it just sounds like a V8 should. The old mufflers were some Turbo thing as that's all it had stamped on it and sounded fairly good, but the aero chambers are something better again. 

As for exchange rates it's something I know all too well about for the last 25 years and on top of that the shipping costs to Australia aren't cheap either. Not much we can do about it but to just grin and bear it and either buy what you want or don't. Or there's always buy the same parts here from our stores and pay at the very least 20% more than bringing it in. It's a no brainer to me

 Ok my friend, sounds like a plan on those mufflers. I've been very impressed with your comments and opinions as you obviously know your stuff. It's good to know that there are people out there that care and give honest input. If we relied on what the vendors say about their products, sorry, but we'd all in trouble.

As for the exchange rates and shipping, I hear you brother, it hurts! For us in Canada, there are a few vendors, but we mostly have to rely on buying in the US. For me, I'm somewhat lucky as there is a NPD outlet only 1 1/2 hrs drive across the border.

Geoff.

Geoff.

 I learn something new every day!

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I have Flowmaster 40's on my 351 4V and they sound great, get lots of good comments. Downside is droning at 2500 rpm that goes away at 3000. This is common on these cars, but my exhaust specialist claims that the Flowmaster's are the main cause. He recommends Dynomax saying they are about the same sound, but without the drone. I've not heard a set of them so I can't say for sure. Maybe he just wants to sell me a set as that is what he sells! I have to replace my old exhaust soon, so if anyone can confirm, I'm all ears.

Geoff.

Flowmasters drone at that rpm.   It's not just in these cars, it's not just this kind of exhaust configuration.  It's a problem with the design.  Flowmaster has tried a number of things to fix that over the years, the big thing was the deltaflow version of their mufflers, but nothing entirely eliminates it.  If you like the sound of their 40 series mufflers (the basic "flowmaster") and if you want your best chance of getting rid of the drone then try the super 44 with deltaflow.  Those usually sound pretty good and don't drone on most cars.

 

That said, flowmasters are not the performance mufflers people think they are.  People associate the sound with performance but there have been OEM mufflers going back into the 90's that have flowed better than flowmasters.  If you like the sound go for it, but be aware that you aren't getting the best performance.  Personally they have a metallic, tinny quality that I don't like.

 

My Borlas are pretty quiet and very mellow.  

 

[video=youtube]

What size wheels and tires are those?  That's a perfect old school muscle car look with a great stance.

 

 

 NO DRONE!! Now That is very interesting and as you say cheap (ish). Nearly 40% on our Canadian dollar ups it a bit, but still worth considering.

Thanks for your input.

 

None what so ever, then again I've always designed my systems to eliminate drone. The biggest problem is people put too big of a pipe on for their application. Most people don't want to believe what size pipe will handle X amount of power. The bigger is better thought transfers over to pipe diameters way too often. The amount of times I've seen twin 2 1/2" systems on 350 even 400+ HP engines then complain about drone is laughable. I've even met people that don't even realise what drone is as they think that's how it's just meant to sound. Nothing better than having the top down on the vert and hearing that proper V8 sound and tap the pedal,and it just sounds like a V8 should. The old mufflers were some Turbo thing as that's all it had stamped on it and sounded fairly good, but the aero chambers are something better again. 

As for exchange rates it's something I know all too well about for the last 25 years and on top of that the shipping costs to Australia aren't cheap either. Not much we can do about it but to just grin and bear it and either buy what you want or don't. Or there's always buy the same parts here from our stores and pay at the very least 20% more than bringing it in. It's a no brainer to me

 Ok my friend, sounds like a plan on those mufflers. I've been very impressed with your comments and opinions as you obviously know your stuff. It's good to know that there are people out there that care and give honest input. If we relied on what the vendors say about their products, sorry, but we'd all in trouble.

As for the exchange rates and shipping, I hear you brother, it hurts! For us in Canada, there are a few vendors, but we mostly have to rely on buying in the US. For me, I'm somewhat lucky as there is a NPD outlet only 1 1/2 hrs drive across the border.

Geoff.

What you can get away with vs what makes the best power is very different.  For that matter, on the street people can't really tell a 10hp or more change and react more to a sound change.  That's why flowmaster's sell, they make your car sound more like a race car, and even though they might hurt performance in many cases they sound better so people feel like they made their cars faster.

 

Putting a smaller diameter pipe on an exhaust increases velocity and lowers tuning frequency (If you're interested look up Helmholtz tuning), so typically a smaller pipe that is the same length will sound lower and will have less objectionable qualities at partial throttle (less droning, gurgling...), that doesn't mean that it's better matched to the engine or that the engine doesn't need more flow, it's just taking advantage of helmholtz tuning and increasing exhaust velocity at light load(forcing exhaust to flow straight through, turbulance/funny flow is what causes droaning and other weird noises), and likely killing performance at heavy loads/wot.  If you want a perfect example of this, if you want a great sounding exhaust on a v8 (especially trucks) you Y the pipes together into a single 2-1/4" pipe, put a glasspack in that and then split it off into 2 tailpipes with some nice chrome tips.  It will sound deep, powerful and still mellow and not annoying inside (trucks tend to have a boxy cabin without a lot of sound deadening making droning and other maladies worse).  2" or 2-1/4" duals sound great on most musclecars with any loud performance mufflers, and if it was built since the late 80's probably flow less than the stock exhaust and measurably hurt performance.  

 

The solution for most people if they care about performance is to size the pipes accordingly and then use a straight through style muffler (my choice tends to be the dynomax ultra flow welded, but hooker max flow, magnaflow, borla... all have stuff that works).  With larger exhausts this sometimes means living with a loud exhaust, but there are tricks to tame that down without hurting performance.  If you're looking for a more classic muscle car sound then look at a turbo muffler like the dynomax super turbo (they have "hemi" mufflers that have larger flow tubes inside and have almost the flow of a straight through muffler).  One of the best sounding mufflers out there that still has good flow and a design that tends to eliminate most droning/popping... is the Hooker Aerochamber, I've never seen one installed that didn't sound great.

[align=center]M a r k

'71 Mustang Mach 1 | M Code 351C (with 2bbl heads) | C6

aka: Silverback, WS6 TA, JYDog, 83 Crossfire TA, mpikas, mmp...[/align]

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I've had good luck with these Borlas https://www.summitracing.com/parts/bor-40358 I based my decision on a dyno test I saw online where they also checked loudness in decibels. These were both quietest and most power/torque. Not by a wide margin, but I really like them in that they're very compact. I use them on my 460 powered '79 Ranchero, and I have another set in the box to go on my '72 Mustang. Also recommend band clamps for ease of disassembly. Still makes a good mellow sound that doesn't irritate the neighbors.

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I've had good luck with these Borlas https://www.summitracing.com/parts/bor-40358 I based my decision on a dyno test I saw online where they also checked loudness in decibels. These were both quietest and most power/torque. Not by a wide margin, but I really like them in that they're very compact. I use them on my 460 powered '79 Ranchero, and I have another set in the box to go on my '72 Mustang. Also recommend band clamps for ease of disassembly. Still makes a good mellow sound that doesn't irritate the neighbors.

 

Yeah. I got tired of my neighbors complaining about my car so I am moving. Drives me nuts as it isn't that loud. They all complain that they can hear me start it up in the morning if I decided to take it to work. Moving out of town on a couple of acres with no close neighbors to complain. Can't wait. Closing on new place July 10!

73 Grande H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

 

- Jason

 

 

082-hot-rod-power-tour-2017-1970-1970s.jpg

 

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We had a harley guy. He liked to drink and then fire up the bike at 11pm and just idle/rev it in his garage. He was a neighborhood favorite. ;)

 

Our next door neighbor has an older ford diesel. He will start it up and let it idel for like 10 minutes before leaving. It's kind of annoying.

 

I suppose some of my neighbors don't like the Mustang. Fortunatly I normally drive it after most people are up and before they go to bed. I know it's not too loud because some of the neighbor kids on their bikes don't hear me coming. Which is hard to believe.

'Mike'

73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

 

Pics of modifications included in: [button=http://www.7173mustangs.com/thread-1973-convertible--3335]My Garage[/button]

 

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