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Anyone running magnaflow Mufflers
#1
I know there's been lots of discussion about mufflers on this site but I can't find the answer I'm looking for. I have Flowmaster 40 series on my car 73 vert now and while they sound great, the resonance at highway speed is almost unbearably loud inside the car, no way to carry on a conversation without screaming. Thinking about changing to Magnaflow mufflers but wondering if resonance is still a problem. Their description in summit catalog says no resonance but would like to hear first hand experience.
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#2
(01-05-2019, 05:28 PM)mbrew2 Wrote: I know there's been lots of discussion about mufflers on this site but I can't find the answer I'm looking for. I have Flowmaster 40 series on my car 73 vert now and while they sound great, the resonance at highway speed is almost unbearably loud inside the car, no way to carry on a conversation without screaming. Thinking about changing to Magnaflow mufflers but wondering if resonance is still a problem. Their description in summit catalog says no resonance but would like to hear first hand experience.

 Yeah, me too. I have the same drone on my Flowmaster 40's on my Mach 1, but it only seems to be there between 2000 and 2500 rpm, then it is less.
I too need a new exhaust this year and am undecided what I want. As you say, love the sound but not the drone or resonance.
My exhaust shop guy suggested Dynamax, but no idea how they sound.
What to do, what to do!
Geoff.

I learn something new every day!
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#3
I’m pretty sure mine are dynamax, they just say turbo on them. I have heard a lot of guys talking about a drone or their  exhaust is to loud on the highway. I really don’t think that about these mufflers, they are not that bad at all. But I do have cast iron exhaust manifolds. I have only had these, never any other brand on this car, so I can’t really make a good comparison.
I am having engine rebuilt and headers put on, so I’m sure it’s going to be louder than before. I’ll let you guys know what I think after it’s done.

run_horse Run Horse Run!
John 72 Q Code
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#4
(01-05-2019, 05:28 PM)mbrew2 Wrote: I know there's been lots of discussion about mufflers on this site but I can't find the answer I'm looking for. I have Flowmaster 40 series on my car 73 vert now and while they sound great, the resonance at highway speed is almost unbearably loud inside the car, no way to carry on a conversation without screaming. Thinking about changing to Magnaflow mufflers but wondering if resonance is still a problem. Their description in summit catalog says no resonance but would like to hear first hand experience.

unfortunately nobody can answer your problem completely because resonance is not always easy to cure in aftermarket systems, however, in general, i have experienced a lot less resonance with the magnaflows over any flowmaster.

.
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#5
My brother in law, switched from flowmaster to magnaflow on his 70 429cj cobra. Much better as far as "drone" goes. We took it out today its not quiet but with the built  cj who needs tunes
[Image: 20190105-105001.jpg]
[+] 1 user Likes keiths71's post
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#6
(01-05-2019, 08:04 PM)keiths71 Wrote: My brother in law, switched from flowmaster to magnaflow on his 70 429cj cobra. Much better as far as "drone" goes. We took it out today its not quiet but with the built  cj who needs tunes
[Image: 20190105-105001.jpg]

Hell ya!
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#7
A loud deep rumble is good, a drone is not. I'll take loud over drone any day. Question is; "how to achieve it"

I learn something new every day!
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#8
(01-05-2019, 08:04 PM)keiths71 Wrote: My brother in law, switched from flowmaster to magnaflow on his 70 429cj cobra. Much better as far as "drone" goes. We took it out today its not quiet but with the built  cj who needs tunes
[Image: 20190105-105001.jpg]

Nice car there!!

I learn something new every day!
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#9
Install these right after your exhaust manifolds or headers.

https://www.carchemistry.com/silencer-insert/

https://www.7173mustangs.com/thread-elim...et-exhaust

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
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#10
(01-05-2019, 08:04 PM)keiths71 Wrote: My brother in law, switched from flowmaster to magnaflow on his 70 429cj cobra. Much better as far as "drone" goes. We took it out today its not quiet but with the built  cj who needs tunes
[Image: 20190105-105001.jpg]


[Image: Daaaaaaamn.jpg]

Bad boys, Bad boys, whatcha gonna do when that Cobra comes for you?!!

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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