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How to make a Flowmaster louder, and less restrictive!


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Old 06-16-2007, 01:23 PM   #1
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How to make a Flowmaster louder, and less restrictive!

Not for those with a fresh new Flowmaster 40, until it breaks in a month, and you know how it sounds!

This is a theory of mine, but I believe it will work on single center outlet flows, I haven't tried it yet, because I haven't had time, nor the ambition, & energy to take my 6 month rusted Flow orig 40 off, But eventually I'll get to it,,, those of you who are ballsy, & willing, I'd like to know your results. Ok, here's the simple mod: All flowmaster orig 40's have an inverted V-shaped baffle plate as the final baffle on the exhaust, drill a 1/4" pilot hole directly in the middle of the inside of the baffle, then use the biggest hole saw you can fit to carefully drill thru the V-baffle (most probably a 2" hole saw) and you're done. This will free up the exhaust flow more like a straight thru muffler, but still leave some muffling, some of the exhaust flow will still go around the V- baffle, and some of the faster higher pitched pulses will go directly out thru the V- baffle first, & faster, this way instead of the exhaust flow roaring, & reverberating, and giving you a baffled hollow can sound, it should produce a louder, sharper, more defined sound, with less roar (but still leaving some baffling) and sounding like a good old steel pack. If you have a Cat on the vehicle, it's not very loud without a muffler anyway with a full tailpipe, I think this would be a most likely candidate for this experiment.
Old 06-16-2007, 02:25 PM   #2
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Re: How to make a Flowmaster louder, and less restrictive!

Chambered mufflers dont "break in"...
Old 06-16-2007, 02:40 PM   #3
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by RustyButTrusty
Chambered mufflers dont "break in"...
They might not "break in" but they do change in sound after the carbon builds up and smoothes out the internal edges... Dosen't make a crazy difference in the sound but I noticed my Flowmaster 40 Series change in sound after awhile. But Sorry MikDee, I'm not cutting mine up to test your theory LOL Your idea does make sense though.
Old 06-16-2007, 02:50 PM   #4
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Re: How to make a Flowmaster louder, and less restrictive!

Oh Mike, Da*m. I completely forgot about that muff I have out in the shed.
I'll get to it next week if you're still interested. Sorry bout that.
Old 06-17-2007, 12:11 AM   #5
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by RustyButTrusty
Chambered mufflers dont "break in"...
BS! Call it what you want, but they do get louder. After 6 months mine sounds way different, and louder then when I put it on. When I get a chance i'll put up a recent sound clip, so you can compare, and eat your words. Then next I will do the mod on my Flow 40, and put up a clip, it maybe awhile for this though.
Old 06-17-2007, 12:27 AM   #6
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Re: How to make a Flowmaster louder, and less restrictive!

yea they do every flowmaster i owned would get louder after a lil while compared to how it sounded right after install
Old 06-17-2007, 12:39 AM   #7
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by TheMcCumbers
They might not "break in" but they do change in sound after the carbon builds up and smoothes out the internal edges... Dosen't make a crazy difference in the sound but I noticed my Flowmaster 40 Series change in sound after awhile. But Sorry MikDee, I'm not cutting mine up to test your theory LOL Your idea does make sense though.
The orig flow 40 is just a big empty can with a V-baffle, and an inlet, & outlet. As it works, the exhaust flow goes in, expands to muffle upon itself as it tries to get out, finally hitting the V-baffle, and flowing around it on both sides, while being compressed by this, then finally finding it's way out. This does create a nice rumble while not being absorbed by fiberglass, but it also deaden's the compression rap because it is not straight thru (there's a baffle in the way), drilling out the baffle will give a somewhat straight thru sound, sharper, louder, with a more distinct compression wrap, with less restriction, & less rumble, while still muffling some around the V-baffle more then a straight pipe. I think it maybe just right for an otherwise stock full tailpipe system that only has a cat ahead of it.

This would be something like the old "Thrush" straight thru steelpack muffler, if anyone remembers them?

Or, also is a similar design to the "Flowtech Afterburner" turbo muffler.
Old 06-18-2007, 07:00 AM   #8
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Re: How to make a Flowmaster louder, and less restrictive!

Im willinf ro cut up a perfectly good muffler for science...theres a muffler shop right next door to my shop so I can steal one ne time...lol...ill do it and post a clip sometime this week if I have the time. And my 40 did for sure "break in" after some time...

Last edited by stevehh : 06-18-2007 at 07:02 AM.
Old 06-18-2007, 10:05 AM   #9
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Re: How to make a Flowmaster louder, and less restrictive!

I'm still waiting for mine to break in...but it's only been 8 years...maybe next week.
Old 06-18-2007, 02:50 PM   #10
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by Rhotpursuit
I'm still waiting for mine to break in...but it's only been 8 years...maybe next week.
Old 06-18-2007, 05:49 PM   #11
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Re: How to make a Flowmaster louder, and less restrictive!

Wouldn't doing this ruin the Flowmaster sound, which is why you buy Flowmasters in the first place.
Old 06-18-2007, 07:05 PM   #12
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Re: How to make a Flowmaster louder, and less restrictive!

Probably, im still intrested in seeing how mean it sounds, even if it loses the flowmaster sound, plus there so many knock offs now a days its unbelieveable so that flowmaster sound is duplicated over and over and over
Old 06-19-2007, 11:35 AM   #13
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by stevehh
Im willinf ro cut up a perfectly good muffler for science...theres a muffler shop right next door to my shop so I can steal one ne time...lol...ill do it and post a clip sometime this week if I have the time. And my 40 did for sure "break in" after some time...
Cool! Way to go,,, put up a sound clip when you can.
Old 06-19-2007, 03:17 PM   #14
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Re: How to make a Flowmaster louder, and less restrictive!

dont look like ill have time to play this week, doing body work on the truck, but next week its on like donkey kong.
Old 06-20-2007, 12:59 AM   #15
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by stevehh
dont look like ill have time to play this week, doing body work on the truck, but next week its on like donkey kong.
Ok, if this works as I planned, I want to be known as the father of the flowmaster mod If not, a famous line from "Mission Impossible" the series: "Mr. Phelp's, If you fail, I'll disavow any knowledge of your actions, this message will self destruct in 5 seconds"
Old 06-20-2007, 01:10 PM   #16
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Re: How to make a Flowmaster louder, and less restrictive!

Old 07-11-2007, 10:53 PM   #17
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Re: How to make a Flowmaster louder, and less restrictive!

LOL@ breaking in a chambered muffler.....
i wish mine would break in already....I had it on my truck since 97...

Im wondering if you are just hearing your cat change your sound since youve had your new muffler...trying to break it in you may have roasted your cat.....
Old 07-17-2007, 11:10 PM   #18
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Re: How to make a Flowmaster louder, and less restrictive!

i had a stang with no cats with flowmaster at one time and they never changed a note, i went to magnaflow and after a lil while they broke in, but i know u cant with a flowmaster
Old 07-18-2007, 12:24 PM   #19
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Re: How to make a Flowmaster louder, and less restrictive!

sorry. im not ruining my flowmaster. i bought mine for that flowmaster sound.
Old 07-19-2007, 01:44 AM   #20
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Re: How to make a Flowmaster louder, and less restrictive!

To all the Naysayers,,, BS, It does break in, and get louder! It gets more boomy as time goes by, when I first put mine on it actually sounded ricey!,,, That's not the case now. If you can't hear the difference you're Deef! Amen!
Old 07-19-2007, 02:14 AM   #21
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by MikDee
To all the Naysayers,,, BS, It does break in, and get louder! It gets more boomy as time goes by, when I first put mine on it actually sounded ricey!,,, That's not the case now. If you can't hear the difference you're Deef! Amen!
At 62, I'd check to see if someone has been messing with the sub in your hearing aid...

Last edited by Rhotpursuit : 07-19-2007 at 02:17 AM.
Old 07-19-2007, 02:40 AM   #22
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Re: How to make a Flowmaster louder, and less restrictive!

ok well i had a stang with no cats and it was run like that for 2 years and the exhaust note never changed, maybe i had special flows on it lol
Old 07-20-2007, 05:40 PM   #23
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Re: How to make a Flowmaster louder, and less restrictive!

OK, here's the deal..

I finally read this thread, and I figured I would go straight to the source( I got home very early from work, and the cable is out, so I've got some time to kill)......

http://www.flowmastermufflers.com/pr...age=contact_us

Called that number, (press 1 for tech support) spoke to a fellow named Ernie. He says that at no time so far, to his knowledge at least (for purposes of full disclosure), has any testing of theirs shown there to be any "break-in" in terms of flow rates or decibel levels. He said he has heard this many times before, and doesn't argue that it doesn't seem like a reasonable hypothesis, but in the end he said it was just plain not correct.

Last edited by 02_Black_XBlazer : 07-20-2007 at 05:51 PM.
Old 07-20-2007, 07:52 PM   #24
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Re: How to make a Flowmaster louder, and less restrictive!

Wow...

Groovy.

Thanks for doing the homework!
Old 07-20-2007, 08:41 PM   #25
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by 97NAS10SS
OK, here's the deal..

I finally read this thread, and I figured I would go straight to the source( I got home very early from work, and the cable is out, so I've got some time to kill)......

http://www.flowmastermufflers.com/pr...age=contact_us

Called that number, (press 1 for tech support) spoke to a fellow named Ernie. He says that at no time so far, to his knowledge at least (for purposes of full disclosure), has any testing of theirs shown there to be any "break-in" in terms of flow rates or decibel levels. He said he has heard this many times before, and doesn't argue that it doesn't seem like a reasonable hypothesis, but in the end he said it was just plain not correct.
Exactly.
Old 07-25-2007, 09:32 AM   #26
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by Rhotpursuit
At 62, I'd check to see if someone has been messing with the sub in your hearing aid...
Thanks, But I don't need one Yet!,,, I just sometimes play deaf to the old lady
But, I don't care what some techie said, I'm tellin you that mine was tinny sounding when I first put it on, and now it's more boomy sounding, if not break in, call it what you will, the tone did change! I guess I'll have to put up another recent sound clip to show ya
Old 06-12-2008, 09:43 PM   #27
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Re: How to make a Flowmaster louder, and less restrictive!

hmm id like to test this myself, i just ordered duel 40s w n/cat gonna put them on tonight and record first sound and do it again in like a month.
Old 06-13-2008, 12:38 AM   #28
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Re: How to make a Flowmaster louder, and less restrictive!

For the love of God... put the shovel away!
Old 06-13-2008, 05:01 PM   #29
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Re: How to make a Flowmaster louder, and less restrictive!

I'll ad a little fuel to the fire. I dunno if yah want to say break in, BUT they do change their tune. I had a new set of 2 chambers on a car I had years ago. The whole exhaust was new. Drove it around for 3-4 days, normal driving, it sounded saweet the way it was just puttin' around. Went to go home, and at the time lived with my parents, uphill both ways. So, at the bottom of the hill, did a linelock to get the tires spinning, then hammered it till they stopped. And right after that I noticed that the sound changed. I can't remember if they got louder or throatier or what, but whatever it was the sound changed.

I have Flows on my fullsize Blazer now, sounds OK, but EVERYONE has them now, want a different sound. Gonna try something else and probly give these to a guy I work with...
Old 06-14-2008, 01:54 AM   #30
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by MikDee
To all the Naysayers,,, BS, It does break in, and get louder! It gets more boomy as time goes by, when I first put mine on it actually sounded ricey!,,, That's not the case now. If you can't hear the difference you're Deef! Amen!

Your an idiot! Clean the wax outta your ears!
Old 06-14-2008, 02:08 AM   #31
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Re: How to make a Flowmaster louder, and less restrictive!

Quote: Originally Posted by cevtv
Your an idiot! Clean the wax outta your ears!
I'd expect that from an 18yr old, but a 40 yr old? I guess you haven't grown up yet sonny,,, I was putting Hollywood, Smitty's, & Dynatone, deep tone mufflers on my car when you were just a gleam in your fathers eye! And for your information they do get deeper, I don't give a f*** what you say!

Last edited by MikDee : 06-14-2008 at 02:16 AM.
Old 06-14-2008, 02:26 AM