Magna Flow vs Flowmaster 40 Series
#1
01-18-2010, 10:34 AM
Magna Flow vs Flowmaster 40 Series
Hello,
Just wondering what everyone thought of the two mufflers and why they like them. I currently have Magna Flow on my 76 F-100 with a 390 and it sounds good, but I know Flowmaster 40 series also sounds good too. I was told by my muffler shop the Magna Flow will dyno a bit higher due to a straight through design. What do you all think of the two?
Thanks
OJ
Just wondering what everyone thought of the two mufflers and why they like them. I currently have Magna Flow on my 76 F-100 with a 390 and it sounds good, but I know Flowmaster 40 series also sounds good too. I was told by my muffler shop the Magna Flow will dyno a bit higher due to a straight through design. What do you all think of the two?
Thanks
OJ
#2
01-19-2010, 09:33 AM
The Magnaflow may dyno higher in the top end, depnding on what they get put on and what diamter was used, they sometimes cause a low torque loss. It just depends on how it gets set up. I doubt the average user will notice much difference performance wise. The Flowmaster is known to give its greatest gains in the low to mid rpm range, so if anything, the normal user might notice a slight gain.
The biggest reason people choose a muffler isn't for any performance gains however, it is for the sound. The Magnaflow is quieter and has a deeper sound, the Flowmaster 40 series is louder, and still rumbles, but just sounds rougher and more oldschool.
The biggest reason people choose a muffler isn't for any performance gains however, it is for the sound. The Magnaflow is quieter and has a deeper sound, the Flowmaster 40 series is louder, and still rumbles, but just sounds rougher and more oldschool.
#4
01-23-2010, 11:07 AM
#5
02-13-2010, 09:36 PM
Mufflers
Flowmaster is known as one of the best designed and made. I have used Flowmaster exclusively on all our vehicles for the past
20 years. They are computer designed for the BEST flow and sound
of all the brands...dyno proven. Most racers use them on their race vehicles...yes, even race cars use mufflers. The 70 series is the
quietest, but still gives you that low rumble that most people are
familier with. The lower the numerical number (ex. 40, 44, etc.), the louder they get. This is because they are physically smaller with less baffles. Go to their website and check them out. If you buy from FM,
try to get the stainless steel versions, they last forever. All the brands are competitive, depending on the material that they are made of. This
will determine how often you will be buying replacement mufflers. Same
goes for your pipes too...aluminized or stainless.
Also consider a K&N intake, headers, etc, etc.
Rent-A-Man! lawn & tree
Killeen, TX
#6
02-16-2010, 07:25 PM
#7
03-07-2010, 07:47 AM
Postmaster
Muffler Dyno Numbers - 5.0 Mustang & Super Fords Magazine
Here are dyno and dB numbers for a ton of different mufflers on a 5.0 Mustang. There's really not a lick of difference between the lot of them from a performance standpoint.
If someone gave me a pair of Flowmaster mufflers I would take them to a shop and see how much out of pocket they'd want along with the Flowmasters for a pair of Magnaflow mufflers. But that's just me.
Here are dyno and dB numbers for a ton of different mufflers on a 5.0 Mustang. There's really not a lick of difference between the lot of them from a performance standpoint.
If someone gave me a pair of Flowmaster mufflers I would take them to a shop and see how much out of pocket they'd want along with the Flowmasters for a pair of Magnaflow mufflers. But that's just me.
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#8
08-25-2010, 02:01 PM
#9
08-27-2010, 07:23 PM
Postmaster
#10
08-28-2010, 08:52 PM
Magnaflow guys hate the sound of a Flowmaster.
Flowmaster guys hate the sound of a Magnaflow.
It's the ever and ongoing debate.
Gonna try the FM40.
If it sounds too "hollow" I may try a WickedFlow...
I am not a big fan of packed mufflers though.
-cmc-
#11
09-16-2010, 07:09 AM
#12
09-16-2010, 09:34 AM
To the OP, just listne to videos on Youtube, see what you like the most, you may end up going with neither.
#13
09-16-2010, 10:42 AM
Muffler Dyno Numbers - 5.0 Mustang & Super Fords Magazine
Here are dyno and dB numbers for a ton of different mufflers on a 5.0 Mustang. There's really not a lick of difference between the lot of them from a performance standpoint.
If someone gave me a pair of Flowmaster mufflers I would take them to a shop and see how much out of pocket they'd want along with the Flowmasters for a pair of Magnaflow mufflers. But that's just me.
Here are dyno and dB numbers for a ton of different mufflers on a 5.0 Mustang. There's really not a lick of difference between the lot of them from a performance standpoint.
If someone gave me a pair of Flowmaster mufflers I would take them to a shop and see how much out of pocket they'd want along with the Flowmasters for a pair of Magnaflow mufflers. But that's just me.
Exhaust is really outside of the realm of this section of the boards, so you really need to give us a call to go over this in proper detail.
Though it's not an absolute must, yes, we do recommend getting rid of the "Slowmaster" muffler and replacing it with an appropriate Magnaflow unit - that will help to improve torque. Now exactly which muffler you use will depend on what kind of sound characteristics you want, so that's why you need to call, so we can go over all of that with you. It's not just length alone, for example.
What that Flowmaster setup is doing is actually *reducing* torque on part throttle at any rpm, and reducing torque below about 3000 rpm a at any throttle position - and that is due to all those silly baffles & chambers they use as part of their "sound engineering" - all they are is impediments to airflow, and slow down exhaust gas velocity, which is why you don't see much in the way of HP gains form them, and actually lose torque, especially in the lower rpm ranges. When it comes to torque, exhaust gas *velocity* is absolutely key.
No, we will not need to change what we do in the tuning if you change to a different cat-back exhaust system or just do a muffler change like that - that will be fine.
Though it's not an absolute must, yes, we do recommend getting rid of the "Slowmaster" muffler and replacing it with an appropriate Magnaflow unit - that will help to improve torque. Now exactly which muffler you use will depend on what kind of sound characteristics you want, so that's why you need to call, so we can go over all of that with you. It's not just length alone, for example.
What that Flowmaster setup is doing is actually *reducing* torque on part throttle at any rpm, and reducing torque below about 3000 rpm a at any throttle position - and that is due to all those silly baffles & chambers they use as part of their "sound engineering" - all they are is impediments to airflow, and slow down exhaust gas velocity, which is why you don't see much in the way of HP gains form them, and actually lose torque, especially in the lower rpm ranges. When it comes to torque, exhaust gas *velocity* is absolutely key.
No, we will not need to change what we do in the tuning if you change to a different cat-back exhaust system or just do a muffler change like that - that will be fine.
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05-01-2011, 09:36 PM
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