muffler question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brisonac · 07-02-2013, 07:30 PM

just put my exhaust on my 402, 2 1/4 inch piped dueled with flowmaster 40's (my dad bought them without me knowing)
they exit right in front of the rear tire but they had to put the muffler real far back. but my problem is that it is really quiet, but my dad said that was because it was so far back. is that true? if so what other muffler would you get to have a deep loud rumble sound?
also its running close to 400 hp and 10:1 compression if that helps

**TBONE1964** · 07-02-2013, 09:01 PM

I have some expereince working at a muffler shop about 25 years ago and I do not or will I ever believe that muffler position has anything to do with noise level. Does your truck have headers or exhaust maniflods? Typically headers produce a little more noise. What configuration is your truck? Is is long bed 2 wd / short bed 4wd, etc?

The mufflers really only fit good in the factory position which is just behind the cab. My advise would have been to use 2 1/2 inch pipe and point the tail pipes toward the ground for some extra noise. If that is not enough, you can just run a straight pipe were the mufflers were, that will get a lot of attention and make a lot of noise too.

brisonac · 07-02-2013, 09:39 PM

Headers, an long 2wd. And the muffler is just past the cab under te bed
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Square_78 · 07-03-2013, 12:35 AM

I have headers in mine with flow master 40's in a true dual setup and its LOUD. I need ear plugs on the highway. 94db inside the cab with the windows up. I can't imagine anyone wanting their exhaust louder than that. If your exhaust is too quiet then change the mufflers or use resonators instead of mufflers. Shouldnt be hard to get a small block Chevy to blast your ear drums if you want it to.
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BlackedOut67shorty · 07-03-2013, 03:39 AM

Glasspacks out the sides..that should get some attention
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AirSpeed · 07-03-2013, 04:55 PM

I have a pair of 40s in my shortbed, they're almost to the rear axle and they are loud. Are you sure yours are 40s? I can't see your pipes to the muffs being to much further back than mine are, specially if they exit in front of your tires, mine exit behind. I have stainless tips on mine, they're 3" in diameter and I think they make it a little louder.
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volksworld · 07-03-2013, 05:05 PM

I think your dad bought something quiet to keep you out of trouble and TOLD you they were 40s

chuckmc8 · 07-03-2013, 06:19 PM

Mine: 2WD Blazer with 2004 5.3 with factory exhaust manifolds- 40 Flowmaster with 2 1/2" Head pipes and 2 1/4" Tailpipes. Mufflers in the correct location. Sounds great and not too loud and no resonance. Tailpipes are out under rear bumper. I'm not running the top on the Blazer, that may make a difference, but Im not planning on runnin' with a roof

**Ol Blue K20** · 07-03-2013, 06:28 PM

Ive never heard a quiet 40, I think he's pulling your leg
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GASoline71 · 07-03-2013, 07:09 PM

Quote:

Originally Posted by BlackedOut67shorty

Glasspacks out the sides..that should get some attention
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Yeah but glasspacks sound like crap!

Quote:

Originally Posted by Ol Blue K20

Ive never heard a quiet 40, I think he's pulling your leg
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I agree... I have 40's on my '72 GMC and it is a loud mo-fo. Loud enough to set car alarms off in parking lots. I have a lot of buds that are running 40's as well... they are not quiet.

Gary

**WIDESIDE72** · 07-03-2013, 08:14 PM

I had FM 40's dumping at axle on my 79 malibu w/383 and it was too loud. I have never heard complaint that 40's were too quiet. The 383 recently self destructed and i installed a milder 355.. I am also swapping the 40's for Sonic Turbos and tail pipes.
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BlackedOut67shorty · 07-03-2013, 10:37 PM

[QUOTE=GASoline71;6155477]Yeah but glasspacks sound like crap! :lol

Yeah lol they do, especially going down the highway at 65, been trying to find a Lil more mellow exhaust. When I was first driving I wanted it stupid loud, have it like that when you start driving and it got old fairly quick
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jhwkns · 07-03-2013, 10:47 PM

I've got the biggest quietest mufflers I could find. 2.5 in 2.5 out. Free flowing, and I can talk to my passenger on the highway without shouting. Your Dad is wise. The noise gets old real quick. Put some cutouts on it, and you can be real loud when you wish.

GASoline71 · 07-04-2013, 12:06 AM

What fun is that?

Gary

brisonac · 07-05-2013, 12:56 PM

That's pretty weird. Would the exit points of the exhaust make a difference? I was thi king cut outs to, just so I can be as on obnoxious as I want. This isn't a daily driver either, just for fun and for car shows
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BlackedOut67shorty · 07-05-2013, 02:05 PM

Quote:

Originally Posted by brisonac

That's pretty weird. Would the exit points of the exhaust make a difference? I was thi king cut outs to, just so I can be as on obnoxious as I want. This isn't a daily driver either, just for fun and for car shows
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Yes it would
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weever82 · 07-05-2013, 07:45 PM

Get underneath the truck and look at the numbers on the muffler and check it out online. It will tell you if they are 40's or maybe something quieter like 50's...

GASoline71 · 07-05-2013, 09:51 PM

My exhaust is 3" and dumps out in front of the rear tires at an angle.

Gary

elf w/capital T · 07-06-2013, 06:44 AM

Really you guys think that fm40s are loud?? Well what muffler n setup did you go with? I had some imitators of the 40s the previous owner put on, i liked and thought they were fm40s... but i WAS going to get them, but ya guys are saying they are loud.....

ironroad9c1 · 07-06-2013, 10:07 AM

well first off flows are the worst flowing muffer out there next to stock, second 2 1/4 pipe is too small for any performance small block, you need tom dynomax ultraflows, hooker areo chamber, or magnaflows , hell even the cheapo summit turbo mufflers outflow flow crappers.

Square_78 · 07-06-2013, 05:47 PM

Quote:

Originally Posted by GASoline71

Yeah but glasspacks sound like crap!

I agree... I have 40's on my '72 GMC and it is a loud mo-fo. Loud enough to set car alarms off in parking lots. I have a lot of buds that are running 40's as well... they are not quiet.

Gary

I agree. Mine sets off car alarms when I just idle through a parking lot with my foot off the gas.
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Toxic Orange · 07-06-2013, 11:35 PM

I've got 40's that sit just about under my seat, headers and 2 1/2 inch pipe. Exit is out the side in front of the rear tire. 3" resonating tips and they are loud but meaty, just like I wanted. Most would think (and be right) that they were too loud if a daily driver, but for a weekend driver they work great. Does yours have any type of chrome tips? That seems to make a big difference.

elf w/capital T · 07-07-2013, 07:45 AM

Toxic, those look pretty nice!
How about these chambered mufflers jegs brand... anyone?

http://www.jegs.com/p/JEGS-Performan...25416/10002/-1

elf w/capital T · 07-07-2013, 07:48 AM

Brisonac, sorry didnt mean to jack your thread! Mods can delete post!

brisonac · 07-07-2013, 10:19 PM

Wait up. It's a 402 bb. And 2 1/2 in exhaust. Sorry bout saying 2 1/4
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07-02-2013, 07:30 PM	#1
brisonac Registered User Join Date: Sep 2012 Location: Eads CO Posts: 28	muffler question just put my exhaust on my 402, 2 1/4 inch piped dueled with flowmaster 40's (my dad bought them without me knowing) they exit right in front of the rear tire but they had to put the muffler real far back. but my problem is that it is really quiet, but my dad said that was because it was so far back. is that true? if so what other muffler would you get to have a deep loud rumble sound? also its running close to 400 hp and 10:1 compression if that helps __________________ My Fleet: 1968 Mustang,1972 C10, 2002 Lincoln LS Father and grandfater restored Fleet: 1957 Bel Air 2door convertable, (in progress) 1957 4 door post, (in progress) 1959 Star Chief, 1966 Impala, and many others

07-02-2013, 09:01 PM	#2
TBONE1964 Cluster King Join Date: Nov 2012 Location: Junction City, OR Posts: 5,262	Re: muffler question I have some expereince working at a muffler shop about 25 years ago and I do not or will I ever believe that muffler position has anything to do with noise level. Does your truck have headers or exhaust maniflods? Typically headers produce a little more noise. What configuration is your truck? Is is long bed 2 wd / short bed 4wd, etc? The mufflers really only fit good in the factory position which is just behind the cab. My advise would have been to use 2 1/2 inch pipe and point the tail pipes toward the ground for some extra noise. If that is not enough, you can just run a straight pipe were the mufflers were, that will get a lot of attention and make a lot of noise too.

07-02-2013, 09:39 PM	#3
brisonac Registered User Join Date: Sep 2012 Location: Eads CO Posts: 28	Re: muffler question Headers, an long 2wd. And the muffler is just past the cab under te bed Posted via Mobile Device __________________ My Fleet: 1968 Mustang,1972 C10, 2002 Lincoln LS Father and grandfater restored Fleet: 1957 Bel Air 2door convertable, (in progress) 1957 4 door post, (in progress) 1959 Star Chief, 1966 Impala, and many others

07-03-2013, 12:35 AM	#4
Square_78 Registered User Join Date: Mar 2012 Location: Okanagan Valley, BC, Canada Posts: 1,237	Re: muffler question I have headers in mine with flow master 40's in a true dual setup and its LOUD. I need ear plugs on the highway. 94db inside the cab with the windows up. I can't imagine anyone wanting their exhaust louder than that. If your exhaust is too quiet then change the mufflers or use resonators instead of mufflers. Shouldnt be hard to get a small block Chevy to blast your ear drums if you want it to. Posted via Mobile Device __________________ #teamlongbed "I refuse to go disc brakes. I actually love drum brakes. It makes for an adventure." - 50bomb 1978 Chevy shop truck - static 6/8" 1970 GMC 1500 - Accuair eLevel Resto-mod http://67-72chevytrucks.com/vboard/s...d.php?t=537497

07-03-2013, 03:39 AM	#5
BlackedOut67shorty Registered User Join Date: Aug 2012 Location: error 404 location not found Posts: 816	Re: muffler question Glasspacks out the sides..that should get some attention Posted via Mobile Device __________________ 1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll Last edited by BlackedOut67shorty; 07-03-2013 at 03:45 AM.

07-03-2013, 04:55 PM	#6
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: muffler question I have a pair of 40s in my shortbed, they're almost to the rear axle and they are loud. Are you sure yours are 40s? I can't see your pipes to the muffs being to much further back than mine are, specially if they exit in front of your tires, mine exit behind. I have stainless tips on mine, they're 3" in diameter and I think they make it a little louder. Posted via Mobile Device Posted via Mobile Device __________________ http://smg.photobucket.com/albums/v655/aaronhero/

07-03-2013, 05:05 PM	#7
volksworld Registered User Join Date: Apr 2011 Location: formerly NY currentlyNC Posts: 390	Re: muffler question I think your dad bought something quiet to keep you out of trouble and TOLD you they were 40s __________________ 1970 short step c10 leaf spring 454

07-03-2013, 06:19 PM	#8
chuckmc8 It's alsways something..... Join Date: Nov 2008 Location: Douglasville GA Posts: 1,171	Re: muffler question Mine: 2WD Blazer with 2004 5.3 with factory exhaust manifolds- 40 Flowmaster with 2 1/2" Head pipes and 2 1/4" Tailpipes. Mufflers in the correct location. Sounds great and not too loud and no resonance. Tailpipes are out under rear bumper. I'm not running the top on the Blazer, that may make a difference, but Im not planning on runnin' with a roof __________________ 1968 RS Camaro 'Vert Matching number 327 and M21 Muncie 1968 C10 Black with red interior and orig paint. 5.3 / 4l60e,3:73 POSI 17" Torq Thrusts 1968 CST 514 Red with black interior. Buddy Buckets, Factory A/C, PS, PB- 20" AR custom shop TT, 5.3 and 4l60e

07-03-2013, 06:28 PM	#9
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,245	Re: muffler question Ive never heard a quiet 40, I think he's pulling your leg Posted via Mobile Device __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul

07-03-2013, 08:14 PM	#11
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: muffler question I had FM 40's dumping at axle on my 79 malibu w/383 and it was too loud. I have never heard complaint that 40's were too quiet. The 383 recently self destructed and i installed a milder 355.. I am also swapping the 40's for Sonic Turbos and tail pipes. Posted via Mobile Device

07-03-2013, 10:37 PM	#12
BlackedOut67shorty Registered User Join Date: Aug 2012 Location: error 404 location not found Posts: 816	Re: muffler question [QUOTE=GASoline71;6155477]Yeah but glasspacks sound like crap! :lol Yeah lol they do, especially going down the highway at 65, been trying to find a Lil more mellow exhaust. When I was first driving I wanted it stupid loud, have it like that when you start driving and it got old fairly quick Posted via badass Mobile Device __________________ 1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll

07-03-2013, 10:47 PM	#13
jhwkns Registered Cruiser Join Date: May 2002 Location: Las Vegas NV Posts: 2,230	Re: muffler question I've got the biggest quietest mufflers I could find. 2.5 in 2.5 out. Free flowing, and I can talk to my passenger on the highway without shouting. Your Dad is wise. The noise gets old real quick. Put some cutouts on it, and you can be real loud when you wish. __________________ I intend to live forever. So far, so good.

07-05-2013, 12:56 PM	#15
brisonac Registered User Join Date: Sep 2012 Location: Eads CO Posts: 28	Re: muffler question That's pretty weird. Would the exit points of the exhaust make a difference? I was thi king cut outs to, just so I can be as on obnoxious as I want. This isn't a daily driver either, just for fun and for car shows Posted via Mobile Device __________________ My Fleet: 1968 Mustang,1972 C10, 2002 Lincoln LS Father and grandfater restored Fleet: 1957 Bel Air 2door convertable, (in progress) 1957 4 door post, (in progress) 1959 Star Chief, 1966 Impala, and many others

07-05-2013, 07:45 PM	#17
weever82 Registered User Join Date: Sep 2012 Location: Queen Creek, AZ Posts: 551	Re: muffler question Get underneath the truck and look at the numbers on the muffler and check it out online. It will tell you if they are 40's or maybe something quieter like 50's... __________________ Weev- Life's tough...... It's even tougher when your stupid - John Wayne

07-06-2013, 06:44 AM	#19
elf w/capital T Registered User Join Date: Feb 2011 Location: North Carolina Posts: 994	Re: muffler question Really you guys think that fm40s are loud?? Well what muffler n setup did you go with? I had some imitators of the 40s the previous owner put on, i liked and thought they were fm40s... but i WAS going to get them, but ya guys are saying they are loud.....



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07-06-2013, 10:07 AM	#20
ironroad9c1 Master Hater Join Date: Apr 2006 Location: Temple,Tx. Posts: 402	Re: muffler question well first off flows are the worst flowing muffer out there next to stock, second 2 1/4 pipe is too small for any performance small block, you need tom dynomax ultraflows, hooker areo chamber, or magnaflows , hell even the cheapo summit turbo mufflers outflow flow crappers. __________________ 1997 C1500 ECSB 4.3/NV3500 8.5 3.42 "This evening, all of you bleeding hearts... why don't just go ahead and hug yourself for the next 20 minutes or so, because there's a really good chance you're gonna be offended".- Captain Owen Honors

07-06-2013, 11:35 PM	#22
Toxic Orange Registered User Join Date: Apr 2013 Location: Flower Mound TX Posts: 173	Re: muffler question I've got 40's that sit just about under my seat, headers and 2 1/2 inch pipe. Exit is out the side in front of the rear tire. 3" resonating tips and they are loud but meaty, just like I wanted. Most would think (and be right) that they were too loud if a daily driver, but for a weekend driver they work great. Does yours have any type of chrome tips? That seems to make a big difference. Attached Images

07-07-2013, 07:45 AM	#23
elf w/capital T Registered User Join Date: Feb 2011 Location: North Carolina Posts: 994	Re: muffler question Toxic, those look pretty nice! How about these chambered mufflers jegs brand... anyone? http://www.jegs.com/p/JEGS-Performan...25416/10002/-1 Last edited by elf w/capital T; 07-07-2013 at 07:47 AM. Reason: URL

07-07-2013, 07:48 AM	#24
elf w/capital T Registered User Join Date: Feb 2011 Location: North Carolina Posts: 994	Re: muffler question Brisonac, sorry didnt mean to jack your thread! Mods can delete post!

07-07-2013, 10:19 PM	#25
brisonac Registered User Join Date: Sep 2012 Location: Eads CO Posts: 28	Re: muffler question Wait up. It's a 402 bb. And 2 1/2 in exhaust. Sorry bout saying 2 1/4 Posted via Mobile Device __________________ My Fleet: 1968 Mustang,1972 C10, 2002 Lincoln LS Father and grandfater restored Fleet: 1957 Bel Air 2door convertable, (in progress) 1957 4 door post, (in progress) 1959 Star Chief, 1966 Impala, and many others

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