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Old 12-09-2017, 01:13 PM   #1
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NO FLOW FLOWMASTERS?

Been looking into new mufflers for the '02 GT AT. I was comparing the chambered mufflers(mostly Flowmaster, but others as well) with the straight thru type(Magnaflow&Dynomax mostly) and thought with the "scavagening of the Flowmaster it would flow on an equal basis with the straight thru type. Boy was I wrong, after reading many articles I noticed there was talk about the chambered restricting flow much worse than the straight thru. Here is one chart I found. Makes wonder why OP would give away that horsepower using Flowmasters, maybe like the tone enough to not care?
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Old 12-09-2017, 11:32 PM   #2
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Think I’ll slap some Flowmasters on the Mach, until I get the cat back I want.
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Old 12-10-2017, 12:09 AM   #3
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I have some welded magnapacks, i like the way they sound

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Old 12-10-2017, 07:31 AM   #4
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I like the way they sound.
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Old 12-10-2017, 12:46 PM   #5
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Originally Posted by jkeaton View Post
I like the way they sound.
Kinda what I thought,the right sound is important, still gotta be an improvement over stock system flow regardless. Another thing to consider is that the straight thru's get louder over time while the Flowmasters do not change in sound unless broken inside. Back to the sound clips, gotta get something going over stock.
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Old 12-10-2017, 12:48 PM   #6
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Flowmasters sound horrible. They were on the 98 I picked up, and only reason they are still on there is bc I'm not spending money on something that will be a bumper exit, once I finish my motor build.

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Old 12-11-2017, 06:42 PM   #7
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Absolute flow numbers are great for marketing but are not really relevant, any properly sized performance muffler has the ability to flow more than the engine can produce. This is why you get little or no additional HP over stock.

Your muffler purchase should be based on sound.
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Old 12-12-2017, 10:22 AM   #8
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You will notice absolutely 0 power difference. Get whatever one sounds best to you.
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Old 12-12-2017, 12:34 PM   #9
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You will notice absolutely 0 power difference. Get whatever one sounds best to you.
yup this is true.

i actually have on right now jegs 2 chambered (40 knocks offs) i bought them for 29.90 each and they have seen about 10k km and a hard 10k at that... no leaks no weak spots. and tbth i get compliments on them all the time, makes me laugh.
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Old 12-12-2017, 01:18 PM   #10
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Like hearing that, any dyno proof to support it? All the crap they dyno and I cannot find anything like this done.
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Old 12-12-2017, 02:38 PM   #11
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Originally Posted by Neuron View Post
Like hearing that, any dyno proof to support it? All the crap they dyno and I cannot find anything like this done.
If you take an honest look at most muffler designs, they are all restrictive to some degree. Depending on muffler placement and tubing size, you may see a horsepower gain, or a loss. Exhaust pulse flow and scavageing is real. Unfortunately most people know very little about air flow or sound waves. The majority of exhaust customers have one thing in mind, and that is sound.

If you are truly looking for performance, and have regulations that call for a muffler, you need to "tune" the exhaust. Heat, cams, crossovers, pipe diameter, bends and their location, etc all need to be considered. What most people forget about is that in a true performance set up, everything is meant for wide open throttle most of the time. Low end torque matters also, and that has to be factored in for maximum launch.

With this bit of info, the exhaust you choose to put on your daily driver, or show car comes down to the sound you like the most.

As for Flowmaster; I cut off my stock mufflers and installed a pair of Super 10s. My fuel mileage around town increased 4 to 5mpg. If you ask me Flowmaster flows pretty good.
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Old 12-13-2017, 12:09 AM   #12
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Originally Posted by Neuron View Post
Like hearing that, any dyno proof to support it? All the crap they dyno and I cannot find anything like this done.
Most of the dyno tests to compare mufflers aren't even accurate anyway. Different days, different ambient temps, car might be heat soaked, different dynos even different vehicles of the same configuration.

They're all going to be within 1hp of each other or so if that. I second the cheap Jegs or Summit knock off brand mufflers if you are just going to get a set of mufflers welded in. They'll work and flow just as well as anything else and sound good doing it.
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Old 12-13-2017, 12:57 AM   #13
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Here is a thorough explaination of exhaust tuning.
http://www.enginelabs.com/engine-tec...gn-and-theory/
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Old 12-13-2017, 01:01 AM   #14
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Originally Posted by Revvv View Post
If you take an honest look at most muffler designs, they are all restrictive to some degree. Depending on muffler placement and tubing size, you may see a horsepower gain, or a loss. Exhaust pulse flow and scavageing is real. Unfortunately most people know very little about air flow or sound waves. The majority of exhaust customers have one thing in mind, and that is sound.

If you are truly looking for performance, and have regulations that call for a muffler, you need to "tune" the exhaust. Heat, cams, crossovers, pipe diameter, bends and their location, etc all need to be considered. What most people forget about is that in a true performance set up, everything is meant for wide open throttle most of the time. Low end torque matters also, and that has to be factored in for maximum launch.

With this bit of info, the exhaust you choose to put on your daily driver, or show car comes down to the sound you like the most.

As for Flowmaster; I cut off my stock mufflers and installed a pair of Super 10s. My fuel mileage around town increased 4 to 5mpg. If you ask me Flowmaster flows pretty good.
So true and there are a lot of misconceptions out there.
Had Super(LOUD) 10's on a 4 bbl 351 Cleveland and they do flow but I really do not believe they fall within any normal categorization of a "muffler".
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Old 12-13-2017, 01:03 AM   #15
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So true and there are a lot of misconceptions out there.
Had Super(LOUD) 10's on a 4 bbl 351 Cleveland and they do flow but I really do not believe they fall within any normal categorization of a "muffler".
No, not at all. They are in a category of their own. They have a unique sound, and if positioned correctly, scavage exhaust fairly well.
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Old 12-13-2017, 01:08 AM   #16
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Originally Posted by scottydsntknow View Post
Most of the dyno tests to compare mufflers aren't even accurate anyway. Different days, different ambient temps, car might be heat soaked, different dynos even different vehicles of the same configuration.

They're all going to be within 1hp of each other or so if that. I second the cheap Jegs or Summit knock off brand mufflers if you are just going to get a set of mufflers welded in. They'll work and flow just as well as anything else and sound good doing it.
Was not aware of those, will definitely check out, money saved on that can go to the next fund-gears, speedo calibration, tranny cooler etc.
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Old 12-13-2017, 05:48 PM   #17
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https://youtu.be/oIsDeI3k2RI

quick exhaust idle clip of the jegs
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