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Why is my new flowmaster 40 so quit?


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Old 05-25-2009, 07:59 PM   #1
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Why is my new flowmaster 40 so quit?

I just put on a new flowmaster 40 muffler on my 04' 4.3L s-10. Everything else is stock, including the cat and tailpipe. From the videos I saw on youtube and from what I have heard this is supposed to be a pretty loud muffler. But after installing it, it is just a tiny bit louder than stock. Is this normal or is something wrong? Also if I put a turn down right at the end of the muffler would that help at all? Any help is appraciated. Thanks
Old 05-25-2009, 08:44 PM   #2
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Re: Why is my new flowmaster 40 so quit?

make sure it is on there the right way with the pipe from the cat goin in the inlet and the tailpipe goin out the outlet, they should b labled on the case, or your cat could be clogged
Old 05-25-2009, 09:01 PM   #3
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Re: Why is my new flowmaster 40 so quit?

It is definitly installed the right way. After I cut the stock muffler off I started it up just to see what it would sound like with no muffler and it still wast very loud, it had a very mellow rumble. Is there any way to clean my cat out or do I just need to hollow it out?
Old 05-26-2009, 03:06 AM   #4
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Re: Why is my new flowmaster 40 so quit?

This is an easy one.
YES it will be quiet. If you have a cat and factory Y pipe you will only be a little bit louder. What kind of setup is this? Single in dual out? If so replace the stock tiny ass Y pipe to a 2.25 and take the catalytic converter off if you don't have emissions. My little brothers truck had a Flowmaster Super 40 catback ('03 reg cab 4.3) and it was barely louder than stock. The Y pipes on these trucks are TINY! Take a look for yourself.
Old 05-26-2009, 09:47 AM   #5
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Re: Why is my new flowmaster 40 so quit?

It is one in and one out. I think I might just dump it at the rear axel. If I hollow out the cat will it decrease my fuel mileage? What about cutting it off and replace it with a piece of pipe?
Old 05-26-2009, 02:03 PM   #6
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by szaffiri
It is one in and one out. I think I might just dump it at the rear axel. If I hollow out the cat will it decrease my fuel mileage? What about cutting it off and replace it with a piece of pipe?
I didn't notice any gas decrease without my cat. If you do remove the cat, make sure you get a mail in tune to make the check engine light go off. The cat being on/off will make a difference as far in sound. Replace that Y pipe, it's like 70-80 bucks for a muffler shop to fab one up for you. Best thing you can do if you want it louder. Check my exhaust note out in the exhaust clip section. I used to run Flowmasters but I now have the setup in my signature.
Old 05-26-2009, 02:18 PM   #7
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Re: Why is my new flowmaster 40 so quit?

i have a 40 series on mine with a 4.3L. I still have everything else stock until you get to the muffler and its a single in/out with a turndown. it's not overly annoying loud but you can definetly tell it isnt stock.
Old 05-26-2009, 07:50 PM   #8
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Re: Why is my new flowmaster 40 so quit?

wait a lil bit longer for it to break in and it might get louder, my borla exhaust was pretty quiet when i first put it on and its gotten a little bit louder but i dont have a cat also and mines a 89 2.5
Old 05-26-2009, 08:19 PM   #9
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by BlueS15
wait a lil bit longer for it to break in and it might get louder
We're still not gonna do away with that myth, huh?
Old 05-26-2009, 08:44 PM   #10
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Re: Why is my new flowmaster 40 so quit?

I had a 50 put on my blazer and wasn't happy with it...too quiet. The other day, I cut the tail pipe off at the outlet....much better now. Still have the factory y-pipe too, but not for long.
Old 05-26-2009, 08:51 PM   #11
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Re: Why is my new flowmaster 40 so quit?

why would anyone want a stock 4.3 to be loud lol. these arent the greatest sounding motors.
Old 05-26-2009, 08:52 PM   #12
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by BlueS15
wait a lil bit longer for it to break in and it might get louder,
what is there to "break in" its triangular shaped metal? god, really? its not a glasspack!

u want louder, get a better muffler like a spintech, also ditch the cat and get a bigger y-pipe.
Old 05-26-2009, 09:24 PM   #13
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 02_Black_XBlazer
We're still not gonna do away with that myth, huh?
It still lives.
Old 05-26-2009, 09:29 PM   #14
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by lowcherrydime
why would anyone want a stock 4.3 to be loud lol. these arent the greatest sounding motors.
Loud = power

RawRRR!!111!!!!!
Old 05-26-2009, 11:04 PM   #15
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Re: Why is my new flowmaster 40 so quit?

i had a super 40 on mine it sucks ass u cant even hear it.i just put in a 3 inch glassback there hella better and louder it sounds like i have v8 in it.
Old 05-27-2009, 07:00 PM   #16
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Re: Why is my new flowmaster 40 so quit?

wat did i do? wat myth, im a new guy here and they it might wear out a lil bit thats wat my borla muffler did or i dont know but its got louder since i put it on maybe its just borlas a cheap brand but i like them
Old 05-27-2009, 08:24 PM   #17
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by BlueS15
wat did i do? wat myth, im a new guy here and they it might wear out a lil bit thats wat my borla muffler did or i dont know but its got louder since i put it on maybe its just borlas a cheap brand but i like them
There's nothing to break in. It's a hollow can with some baffles in it. I've had one on my SS for 10 years and it doesn't sound any different. What sounds good to one person mayt not to another.
Old 05-27-2009, 08:32 PM   #18
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by Rhotpursuit
There's nothing to break in. It's a hollow can with some baffles in it. I've had one on my SS for 10 years and it doesn't sound any different. What sounds good to one person mayt not to another.
The "theory" is that the carbon builds up inside the muffler, thus changing the sound.
Old 05-27-2009, 08:33 PM   #19
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Re: Why is my new flowmaster 40 so quit?

I think 4.3s sound find. Sounds better than a 2.2, IMO.
I have to agree, theres nothing to break in. Its just a metal shell with some baffles.
I think the carbon would make it quieter, depending on the muffler design. If theres any holes in the baffles, wouldn't the carbon eventually clog them up and make it quieter?
Old 05-27-2009, 10:33 PM   #20
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 96blazer
The "theory" is that the carbon builds up inside the muffler, thus changing the sound.
Yeah, I know the theory.. Do you belive it....probably not. Besides, even if it did, the change would be so gradual you'd never notice.
Old 05-27-2009, 11:24 PM   #21
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 03gmcsonoma
there hella better and louder it sounds like i have v8 in it.
Ooh, a two-fer thread...The "break-in", and the "It sounds like an 8", all in one shot. Anyone have any questions about throttle body spacers they'd like to ask?
Old 05-28-2009, 12:18 AM   #22
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Re: Why is my new flowmaster 40 so quit?

Tri-fecta....going once......going twice.....
Old 05-28-2009, 12:51 AM   #23
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 02_Black_XBlazer
Ooh, a two-fer thread...The "break-in", and the "It sounds like an 8", all in one shot. Anyone have any questions about throttle body spacers they'd like to ask?
Don't you know already? They give you 100 horses to the wheels! I got beat by a stock S-10 the other day at a redlight. He beat me by three cars. I asked what he had and he simply responded, "Throttle body spacer." I was so pissed because I wasted all my time and money on my supercharger and other mods!
Old 05-28-2009, 12:37 PM   #24
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Re: Why is my new flowmaster 40 so quit?

hahahaha idk whatever, i guess it is just me that thinks it sounded louder but the throttle body spacers do they really work, can u get like 3-7 hp or is just lies, i was looking for one for my s15 but i just dont want to waste my money on something that doesnt even do anything
Old 05-28-2009, 04:24 PM   #25
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Re: Why is my new flowmaster 40 so quit?

I went from having no muffler to having a 40 single in/dual out yesterday and was blown away at how quiet it is. Outside it sounds nice and mellow with a little growl. Inside it's like night and day after driving without a muffler for ...4 years? lol.
Old 05-29-2009, 01:18 AM   #26
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Re: Why is my new flowmaster 40 so quit?

3 options to make it louder. cut the rustmaster out and just run the cat. get a highflow cat, although to my understanding, the stock cats are pretty good flowing cats. orrr, if you have no emission, cut the cat. theres a zr2 around here running 40's and no cats and its loud as fvck and sounds pretty good imo.
Old 05-29-2009, 01:49 AM   #27
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Re: Why is my new flowmaster 40 so quit?

Damn!

I have the exact opposite problem! Ive got stock pipe from the motor to the cat. Then 2.5 from the cat to a Flowmaster 40 and an quick drop off after that. This thing is real loud, you know it has something there!! I just posted a thread about helping to keep the rumble out of the cab. When i hold a speed this thing is nuts!
Old 05-29-2009, 02:06 AM   #28
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by BobbyDean
Damn!

I have the exact opposite problem! Ive got stock pipe from the motor to the cat. Then 2.5 from the cat to a Flowmaster 40 and an quick drop off after that. This thing is real loud, you know it has something there!! I just posted a thread about helping to keep the rumble out of the cab. When i hold a speed this thing is nuts!
I read that post and don't see how it can be that loud especially since you have stock piping from manifolds to cat. Also you have the cat! I've done numerous setups and the only way mine was loud was with headers/ X or new Y pipe with no cat. Depending on single in dual outlet with the Y pipe and an X pipe with the true duals. Can you post a video? I'm really wanting to hear your setup. My setup now isn't too loud while cruising. But at WOT it will pop your ears.
Old 05-29-2009, 02:15 AM   #29
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 03zq8s10
I read that post and don't see how it can be that loud especially since you have stock piping from manifolds to cat. Also you have the cat! I've done numerous setups and the only way mine was loud was with headers/ X or new Y pipe with no cat. Depending on single in dual outlet with the Y pipe and an X pipe with the true duals. Can you post a video? I'm really wanting to hear your setup. My setup now isn't too loud while cruising. But at WOT it will pop your ears.

I took video when i took the pics but my retarded camera doesnt have sh!t for sound quality and it was just blanking out with the noise. I have a DVD video camera but i cant figure out how to get the videos on my computer LoL...

Im going to try again tomorrow.

All i can say is ive had mufflers on everything ive owned. This takes the cake on all of them. Its so surprising that when i turned the truck on i thought the Y pipe wasnt connected to the cat. It has a flowmaster sound, just real loud when i maintain speed. When i give it a WOT its not that loud,,,

It will go from little throttle sounding loud to alot of throttle it quites and i can hear the normal rumble in the rear then when im up to speed and get off the gas its loud again... annoying!
Old 05-29-2009, 02:21 AM   #30
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by BobbyDean
I took video when i took the pics but my retarded camera doesnt have sh!t for sound quality and it was just blanking out with the noise. I have a DVD video camera but i cant figure out how to get the videos on my computer LoL...

Im going to try again tomorrow.

All i can say is ive had mufflers on everything ive owned. This takes the cake on all of them. Its so surprising that when i turned the truck on i thought the Y pipe wasnt connected to the cat. It has a flowmaster sound, just real loud when i maintain speed. When i give it a WOT its not that loud,,,

It will go from little throttle sounding loud to alot of throttle it quites and i can hear the normal rumble in the rear then when im up to speed and get off the gas its loud again... annoying!
Man I dunno. If you can post a video tomorrow and maybe we can help you a little better. I used to have 2 Flowmaster Super 44's with out a cat and headers and it wass quiet from inside the cab and was only real loud until WOT. It had a bad ass sound though. Check out my exhaust clip in the clip section. That was when I had the Flows. I currenty have what's in my signature.
Old 05-29-2009, 02:40 AM   #31
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Re: Why is my new flowmaster 40 so quit?

I will try for the video tomorrow for sure.

Take your system and cut it in half. Its the same sound'ish, just more *wussy if you know what i mean. but take that sound and throw it all in the cab of a blazer! Thats what it is like...

Ill get some audio... just wanted to start the thread to see what people had to say...

Thanks for the help bro..

By the way your exhaust is my vote for best on s10forum.com
Old 05-29-2009, 02:45 AM   #32
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by BobbyDean
I will try for the video tomorrow for sure.

Take your system and cut it in half. Its the same sound'ish, just more *wussy if you know what i mean. but take that sound and throw it all in the cab of a blazer! Thats what it is like...

Ill get some audio... just wanted to start the thread to see what people had to say...

Thanks for the help bro..

By the way your exhaust is my vote for best on s10forum.com
Yeah man I'll be happy to help. Thanks man I've had a lot of compliments on it. I now have two Spintech Pro shootouts and they are much louder at WOT. I'll soon get a clip. Thanks for the compliment again man. Get that video up and maybe we can figure something out here. The drone inside the cab would get annoying for sure.
Old 05-29-2009, 03:42 AM   #33
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Re: Why is my new flowmaster 40 so quit?

Old 05-29-2009, 02:32 PM   #34
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Re: Why is my new flowmaster 40 so quit?

^^^^^ Hahahaha!
Old 05-30-2009, 03:46 AM   #35
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Re: Why is my new flowmaster 40 so quit?

LoL!!

Thats exactly what i was thinking when writing the thread.

Problem solved though(hopefully) Tomorrow im going to add more pipe from the muffler back.

The OP should cut his after the muffler hahaha ...everyones happy!
Old 05-31-2009, 10:01 PM   #36
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Re: Why is my new flowmaster 40 so quit?

Does anyone else's flomaster look like it was recovered from the bottom of the ocean? I had mine on for a year and it's horribly rusted
Old 05-31-2009, 10:12 PM   #37
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Re: Why is my new flowmaster 40 so quit?

I run stock y-pipe thats flattened from the drop, no cat, and a 40s flow and its crazy loud. But I like it.
Old 05-31-2009, 11:02 PM   #38
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Re: Why is my new flowmaster 40 so quit?

I have a single in/dual out 40 on my truck with turn sowns like the old muscle cars with everything else factory, and it has a nice depe tone at idle and no noise in the cab. I like it..

It has been on there for 4-5 yrs now and still sounds the same It did have a 18 inch glass pac with 18 inch 4 inch tips and it got crazy cruising. I was young and dumb so I changed it to a nice rumble with no resonation in the cab so I can hear myself think or even the radio.

My flo looks the same today as it did when they installed it.

Old 05-31-2009, 11:17 PM   #39
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by NoMaWHiTe
Does anyone else's flomaster look like it was recovered from the bottom of the ocean? I had mine on for a year and it's horribly rusted

Mines been on for 11 years +- and it still looks great. Maybe once it gets broke in it will rust...
Old 05-31-2009, 11:20 PM   #40
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by Rhotpursuit
Mines been on for 11 years +- and it still looks great. Maybe once it gets broke in it will rust...

I'd post pictures of my mine but it makes babies cry and old women shutter.
Old 06-01-2009, 12:36 AM   #41
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by NoMaWHiTe
Does anyone else's flomaster look like it was recovered from the bottom of the ocean? I had mine on for a year and it's horribly rusted
Same here. I recently switched to Spintech and man those Flowmasters were rusted.
Old 06-01-2009, 04:13 PM   #42
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Re: Why is my new flowmaster 40 so quit?

How does it sound compared to the flow? I thought about going spintech but I got the flow for free soo..
Old 06-01-2009, 06:03 PM   #43
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by Dvst8r
How does it sound compared to the flow? I thought about going spintech but I got the flow for free soo..
It's the same general "type" of tone, i guess you could say, that chambered muffler sound, except, just...better. It's a lot less tinny and raspy at full throttle, WAY less resonance at freeway speeds (even with larger-than-stock piping) and it has a much thicker-souding idle. I know these are all kinda strange words to use, but I guess the best way I could put it is that if you like the flows, you'll love the Spins..there just more "full-bodied", is probably the best way to put it.
I'll go ahead and be a whore and re-post them again, but I've got some sound clips in the sticky of my truck with a Super 40, a Super 44, and finally a Spintech Sportsman. Even with the less-then-stellar video quality you can still tell there's a marked difference between the two Flows and the Spintech.


http://videos.streetfire.net/video/9...rock_57295.htm
http://videos.streetfire.net/video/S...Mag_154459.htm
http://videos.streetfire.net/video/S...man_173166.htm

Last edited by 02_Black_XBlazer : 06-01-2009 at 06:09 PM. Reason: added linky
Old 06-02-2009, 02:27 AM   #44
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Re: Why is my new flowmaster 40 so quit?

I like the super 44 and the spintech best. My truck sounds mostly like the super44 i think.
Old 06-02-2009, 03:39 AM   #45
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Re: Why is my new flowmaster 40 so quit?

My Spins are more throaty at WOT. It's definitely noticeable. Both me and 02 Black XBlazer were Flowmaster whores and look at us now trying to convert people over to Spintech. It does have the same tone. In fact after they were installed I was a little pissed off because they had the same tone at idle until I left the muffler shop wide open. Spintech is better all the way around. They are built tougher, and sound better.

Here's a clip in truck.

<embed width="448" height="361" type="application/x-shockwave-flash" wmode="transparent" src="http://i302.photobucket.com/player.s...z/MOV00226.flv">


Last edited by 03zq8s10 : 06-02-2009 at 03:41 AM.
Old 06-02-2009, 04:25 PM   #46
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Re: Why is my new flowmaster 40 so quit?

That thing is a beast. It is really loud in the truck seems like. Was that with the windows down or up? At like 2000-3000 steady cruise mine has a really loud tone in the truck. Mine doesn't have as much of a roar as yours but sounds similar. I'm gonna go watch it again lol.
Old 06-02-2009, 05:28 PM   #47
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 03zq8s10
My Spins are more throaty at WOT. It's definitely noticeable. Both me and 02 Black XBlazer were Flowmaster whores and look at us now trying to convert people over to Spintech.
Who you callin' a whore!?

If one is so inclined to stay/go with Flowmasters, I would definitely recommend the Super 44 over the regular 40s. It's essentially the same tone, but less resonance and tinny-ness. That being said, Spintech ftw, imo.
Old 06-03-2009, 01:32 AM   #48
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by 02_Black_XBlazer
Who you callin' a whore!?

If one is so inclined to stay/go with Flowmasters, I would definitely recommend the Super 44 over the regular 40s. It's essentially the same tone, but less resonance and tinny-ness. That being said, Spintech ftw, imo.
Sorry man. I don't think your'e a whore. lol

Same here on the Super 44's. I've had both the regular 40's and 44's. I liked them but the Spins kill them. The tone is the same but when you hammer it, you'll know what I mean.
Old 06-03-2009, 01:38 AM   #49
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Re: Why is my new flowmaster 40 so quit?

Quote: Originally Posted by Dvst8r
That thing is a beast. It is really loud in the truck seems like. Was that with the windows down or up? At like 2000-3000 steady cruise mine has a really loud tone in the truck. Mine doesn't have as much of a roar as yours but sounds similar. I'm gonna go watch it again lol.
Thanks man. I've put a lot into her. It's pretty loud inside but my friends say it's way louder outside. I've yet to hear it ride away with someone else driving. The windows were down. I had to let out because I saw a car light and didn't wanna chance it. I'm gonna get daytime clips with a friend filming me so i can get a better video. I'm glad you liked it. Thanks again.
Old 06-14-2009, 01:34 PM   #50
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Re: Why is my new flowmaster 40 so quit?

I searched, and at least this is close to topic...

I want a regular 40 series flowmaster muffler

i have an 03 sonoma SLS with 4.3L v6, vin code X

what size inlet/outlet do i need to match up to stock cat?

or what part number muffler have people used with this setup...?

i measured the circumferences of the inlet/outlet of my current exhaust and calculated diameter...

muffler inlet diameter: 2.47in
muffler outlet diameter: 2.27in


I cut off muffler before axle, so i dont think outlet will matter much.


do i just get 2.50 muffler? will that weld up easily? I have a guy who can tig weld for free for me, so id rather just ebay a muffler, and take it to him, versus $150 for local exhaust shop putting it on...


thanks



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