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Anyone running magnaflow Mufflers
#21
I had Dynomax Super Turbos on several cars and was very happy with the sound. If you want a slightly mellower tone, they offer a longer case model than the standard unit that'll still fit in the factory location. I'll have to look at the ones I have at home, had them on my '71 M-code XR-7 and the sound was just right.


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#22
(01-07-2019, 03:56 PM)Hemikiller Wrote: I had Dynomax Super Turbos on several cars and was very happy with the sound. If you want a slightly mellower tone, they offer a longer case model than the standard unit that'll still fit in the factory location. I'll have to look at the ones I have at home, had them on my '71 M-code XR-7 and the sound was just right.

 Interesting comments.
Most seem to think they are a good choice. As I said before, I (and others) love the sound at idle of the Flowmaster40's and I don't mind the sound, windows down, once I get past the "drone zone", but it's that damn drone that needs to be gone.
Would you say they are similar in tone at idle to the Flowmaster 40's? (71 M code)
Geoff.

I learn something new every day!
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#23
No, they are quieter at idle than Flowmaster 40s. If you like the FM sound, but don't want the resonance, get the 50 series Delta Flow. We used to call them the "three chamber" back in the late 90s.


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#24
Another muffler co. that is worth looking at is spin tech. My friend steve on this site has them on his 71 429 and they sound really good. They have a lot of products and options.
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#25
Hemikiller and Keiths71,
Thanks for the info. Sorry it's been a while to get back to you both.
I'll check those choices out.
Geoff.

I learn something new every day!
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#26
Thanks to everyone for the input!

I had a set of turbo mufflers put on yesterday. It was a terrible stormy day down here so I didn't get a chance to really try them out until today.  I had asked the muffler shop for dynomax super turbos but they put on Walkers turbos. I have no idea what difference that makes but I can tell you it is like driving a different car. 

Idle is subdued with just a little sound. I really liked the Flowmasters at idle as one of the first things I heard when people looked at the car, even the Police, was how good it sounded when I idled through a parking lot. They were just too loud for regular driving.

Now I can hear the radio at all speeds and the turbos make pretty good sound when you open it up. No Drone. I guess we all have to sacrifice to make our cars work for the way we drive them but right now I think I'm happy with them.

One thing quieter exhaust confirmed is that my poor fuel mileage(on another post) is mostly my fault. Riding around in moderate traffic today, stop light to stop light, I heard the secondaries coming in on the carb in first gear. Never have been able to hear the engine before with the Flowmasters. I'll try to work on that but who doesn't like to hear a 4-barrel open up!
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#27
mbrew2,
Thanks for your comment on the mufflers. It great to get opinions on different brands. For me , still no idea what I'll go with. I want that FM40 sound, but zero drone and there's the hard part. A Mach 1 ought to sound beefy. A vert, not so much especially with the top down, It does however need to sound like it has an engine under the hood, not a sewing machine.

Your comment about gas mileage was interesting. Without going back to your post on poor gas mileage, I believe you have the Edlebrock carb. I have no idea how these are set up, but on my Holley 670, I can easily change the spring in the secondary vacuum pot. These carbs come with 2 different springs to tune the carb to ones needs. I run the heavier spring so the secondary's don't come on quite so fast. Perhaps your carb can be set up that way as well.

Geoff.

I learn something new every day!
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#28
(01-25-2019, 08:33 AM)Stanglover Wrote: mbrew2,
Thanks for your comment on the mufflers. It great to get opinions on different brands. For me , still no idea what I'll go with. I want that FM40 sound, but zero drone and there's the hard part. A Mach 1 ought to sound beefy. A vert, not so much especially with the top down, It does however need to sound like it has an engine under the hood, not a sewing machine.

Your comment about gas mileage was interesting. Without going back to your post on poor gas mileage, I believe you have the Edlebrock carb. I have no idea how these are set up, but on my Holley 670, I can easily change the spring in the secondary vacuum pot. These carbs come with 2 different springs to tune the carb to ones needs. I run the heavier spring so the secondary's don't come on quite so fast. Perhaps your carb can be set up that way as well.

Geoff.
I wish I could have found a solution for the drone without silencing the sound so much. Turbos are way quieter than the FM40 but still make a little sound. They are far from what I would like to have but will work for now for the way I use the car as an everyday driver. 

I'm running a Summit 600 cfm carb now and its totally tuneable. It would probably be smart of me to follow your suggestion to modify the timing of the secondaries.
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#29
(01-25-2019, 09:34 AM)mbrew2 Wrote:
(01-25-2019, 08:33 AM)Stanglover Wrote: mbrew2,
Thanks for your comment on the mufflers. It great to get opinions on different brands. For me , still no idea what I'll go with. I want that FM40 sound, but zero drone and there's the hard part. A Mach 1 ought to sound beefy. A vert, not so much especially with the top down, It does however need to sound like it has an engine under the hood, not a sewing machine.

Your comment about gas mileage was interesting. Without going back to your post on poor gas mileage, I believe you have the Edlebrock carb. I have no idea how these are set up, but on my Holley 670, I can easily change the spring in the secondary vacuum pot. These carbs come with 2 different springs to tune the carb to ones needs. I run the heavier spring so the secondary's don't come on quite so fast. Perhaps your carb can be set up that way as well.

Geoff.
I wish I could have found a solution for the drone without silencing the sound so much. Turbos are way quieter than the FM40 but still make a little sound. They are far from what I would like to have but will work for now for the way I use the car as an everyday driver. 

I'm running a Summit 600 cfm carb now and its totally tuneable. It would probably be smart of me to follow your suggestion to modify the timing of the secondaries.
Ah, my mistake on the carb. Too many post to keep track of without going back to look each time.
As you say, I would still look at the secondary spring. I found it made a real difference to my mileage as long as I keep my foot out of it, but still barks if I want it to.
By the way, I'm thinking of upping to a Quick Fuel 730 carb. I feel the 4V could use a bit more air, but it might hurt the overall economy a bit. That's for another post though.
Geoff.

I learn something new every day!
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#30
(01-25-2019, 08:33 AM)Stanglover Wrote: For me , still no idea what I'll go with. I want that FM40 sound, but zero drone and there's the hard part. A Mach 1 ought to sound beefy. A vert, not so much especially with the top down, It does however need to sound like it has an engine under the hood, not a sewing machine.

Sorry to be coming in on this discussion late in the day, but if you're still looking I can confirm Magnaflows will still give you 90% of the FM sound at idle with zero drone at higher RPM.  I have done the FM ->Magnaflow conversion on three different Mustangs now with no regrets.

Another option that sound quite similar to Magnaflows without the price tag are Jones Full Boar Performance mufflers. Slightly less rumble than Magnaflows at idle but just as good when you step on it and around half the price!


Cheers,
Brian
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