exhaust sound differences?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dukcaln · 07-19-2011, 02:10 PM

so on my 72 the exhaust goes from headers (duh) to dual flowmaster 2 chamber mufflers and thats it... no tail pipes after the muffler. I like the sound but it can be loud dumping straight out the mufflers under the truck. My question is of much of a change will it make in sound and quality sound if I dump out the side before of after the tire or even out the back... ANY ONE HAVE SOUND CLIPS OF BEFORE AND AFTER from mufflers to tailpipes?

fastwillie 696969 · 07-19-2011, 02:12 PM

its still LOUD

dukcaln · 07-19-2011, 02:20 PM

figured so, just thought it would get better as far as in the cab with it dumping out the side or rear with a few feet of tail pipe, thats all...

fastwillie 696969 · 07-19-2011, 02:23 PM

dump them off to the side in front of the rear tires ,thats what im doing with mine this week

Longhorn Man · 07-19-2011, 02:42 PM

dumped under the vehicle makes it loud inside, and quieter outside.
Dumping it outside the vehicle will make it louder outside, but quieter inside.

Southcity · 07-19-2011, 02:44 PM

Another thing to consider if you are trying to dampen the sound & vibration that carries in to the Cab is the type of exhaust hangers being used, this makes a BIG difference. Obviously the rubber mounted type hangers are best, Rubber J-Hooks are great too, the worst are the metal L-Brackets with just the small round rubber exhaust grommets, these do little to nothing to dampen interior noise from your exhaust.

dukcaln · 07-19-2011, 02:53 PM

Quote:

Originally Posted by Longhorn Man

dumped under the vehicle makes it loud inside, and quieter outside.
Dumping it outside the vehicle will make it louder outside, but quieter inside.

Hmmm, never noticed.... this at idle or under full throttle or cruising speed... or all

Longhorn Man · 07-19-2011, 04:07 PM

at all speeds.
It's not as bad if they dump out midway back under the bed, and obviously, it's worse if they dump right under the cab.
The pipe takes the noise and throws it out where ever the pipe ends... end it under neath, and it just echos around under the vehicle. Even with turndowns, it still 'bounces' right back up to the floor of the truck. Throw the noise out behind the truck with a full set of pipes, and you'll be amazed at how many other 'new noises' you'll pick up on.
It increases driving pleasure a lot when your head isn't being abused with reverbaration and resonating sounds.

Daves70 · 07-19-2011, 06:15 PM

To add those flowmasters are just plain loud mufflers.I went with a full Magnaflow stainless system and it has a quiet rumble when cruising and a pretty good bark when you open it up.I like it way better than the Flowmasters I had before.But everyone has different tastes.

Brock · 07-19-2011, 06:58 PM

what about sound deadener under your carpet???

landsurvey1 · 07-19-2011, 06:59 PM

YouTube has a number of videos showing different exhaust set ups and mufflers.

Frkypunk70 · 07-19-2011, 07:31 PM

I just fixed the same problem your having. I have long tube headers and FM super 40's, it would resonate through the whole truck, you could'nt think much less have a conversation. I cut 4" holes through the crossmember(the one with the carrier) and had it bent out to go in front of the rear tires. My truck has a 8' box and after the crossmember it goes from 2.5 to 2-1/4 but the difference is unreal much quieter. Its probably only 4' more of pipe on each side but now i can hear what my wifes saying

QKENUF4U · 07-19-2011, 07:39 PM

dumped mine behind the tires on my short bed and never had a resonance problem in the cab....

wwotr · 07-19-2011, 07:55 PM

[quote=dukcaln;4799130]so on my 72 the exhaust goes from headers (duh) to dual flowmaster 2 chamber mufflers and thats it... no tail pipes after the muffler. I like the sound but it can be loud dumping straight out the mufflers under the truck. My question is of much of a change will it make in sound and quality sound if I dump out the side before of after the tire or even out the back... ANY ONE HAVE SOUND CLIPS OF BEFORE AND AFTER from mufflers to tailpipes?[quote]

I think I "May" be able to help you.
I'll post a video here. Its my 72 GMC with Flowmaster 40's and the pipes dump out in FRONT of the rear tire.
My 350 is stock.
I was cruising at 55-60mph with 3.73 Gears and a Turbo 350.
I was not "getting on it", just cruising.

‪"RATIKLE" TEST DRIVE 8/18/09 -...

dukcaln · 07-19-2011, 08:55 PM

he thanks all, and I agree the flows are just loud. They would not be my first choice however they did come with the truck along with two 3 chamber flows..... so i am stuck with them cause I don't want to spend too much on the exhaust...

1972RedNeck · 07-20-2011, 11:13 PM

Quote:

Originally Posted by Longhorn Man

dumped under the vehicle makes it loud inside, and quieter outside.
Dumping it outside the vehicle will make it louder outside, but quieter inside.

07-19-2011, 02:10 PM	#1
dukcaln Registered User Join Date: Jul 2011 Location: vacaville ca Posts: 1,304	exhaust sound differences?? so on my 72 the exhaust goes from headers (duh) to dual flowmaster 2 chamber mufflers and thats it... no tail pipes after the muffler. I like the sound but it can be loud dumping straight out the mufflers under the truck. My question is of much of a change will it make in sound and quality sound if I dump out the side before of after the tire or even out the back... ANY ONE HAVE SOUND CLIPS OF BEFORE AND AFTER from mufflers to tailpipes? __________________ 04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP *SOLD* 1972 chevy c10 Last edited by dukcaln; 07-19-2011 at 02:18 PM. Reason: added better picture

07-19-2011, 02:12 PM	#2
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: exhaust sound differences?? its still LOUD __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

07-19-2011, 02:20 PM	#3
dukcaln Registered User Join Date: Jul 2011 Location: vacaville ca Posts: 1,304	Re: exhaust sound differences?? figured so, just thought it would get better as far as in the cab with it dumping out the side or rear with a few feet of tail pipe, thats all... __________________ 04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP *SOLD* 1972 chevy c10

07-19-2011, 02:23 PM	#4
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: exhaust sound differences?? dump them off to the side in front of the rear tires ,thats what im doing with mine this week __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

07-19-2011, 02:42 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: exhaust sound differences?? dumped under the vehicle makes it loud inside, and quieter outside. Dumping it outside the vehicle will make it louder outside, but quieter inside.

07-19-2011, 02:44 PM	#6
Southcity Registered User Join Date: Aug 2007 Location: Redwood City, CA Posts: 1,177	Re: exhaust sound differences?? Another thing to consider if you are trying to dampen the sound & vibration that carries in to the Cab is the type of exhaust hangers being used, this makes a BIG difference. Obviously the rubber mounted type hangers are best, Rubber J-Hooks are great too, the worst are the metal L-Brackets with just the small round rubber exhaust grommets, these do little to nothing to dampen interior noise from your exhaust. __________________ 66 GMC Suburban Custom 66 Chevy K10 Suburban

07-19-2011, 04:07 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: exhaust sound differences?? at all speeds. It's not as bad if they dump out midway back under the bed, and obviously, it's worse if they dump right under the cab. The pipe takes the noise and throws it out where ever the pipe ends... end it under neath, and it just echos around under the vehicle. Even with turndowns, it still 'bounces' right back up to the floor of the truck. Throw the noise out behind the truck with a full set of pipes, and you'll be amazed at how many other 'new noises' you'll pick up on. It increases driving pleasure a lot when your head isn't being abused with reverbaration and resonating sounds.

07-19-2011, 06:15 PM	#9
Daves70 Registered User Join Date: Jul 2011 Location: Mt Brydges Ontario Posts: 181	Re: exhaust sound differences?? To add those flowmasters are just plain loud mufflers.I went with a full Magnaflow stainless system and it has a quiet rumble when cruising and a pretty good bark when you open it up.I like it way better than the Flowmasters I had before.But everyone has different tastes.

07-19-2011, 06:58 PM	#10
Brock upgrading to an older model Join Date: Aug 2007 Location: Sacramento, KY Posts: 346	Re: exhaust sound differences?? what about sound deadener under your carpet??? __________________ 68 stepside, short-box, multi-colored (for now)

07-19-2011, 06:59 PM	#11
landsurvey1 Registered User Join Date: Jan 2009 Location: Arizona Posts: 404	Re: exhaust sound differences?? YouTube has a number of videos showing different exhaust set ups and mufflers.

07-19-2011, 07:31 PM	#12
Frkypunk70 Registered User Join Date: Mar 2010 Location: Scranton,Pa Posts: 423	Re: exhaust sound differences?? I just fixed the same problem your having. I have long tube headers and FM super 40's, it would resonate through the whole truck, you could'nt think much less have a conversation. I cut 4" holes through the crossmember(the one with the carrier) and had it bent out to go in front of the rear tires. My truck has a 8' box and after the crossmember it goes from 2.5 to 2-1/4 but the difference is unreal much quieter. Its probably only 4' more of pipe on each side but now i can hear what my wifes saying __________________ "When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car. "

07-19-2011, 07:39 PM	#13
QKENUF4U Senior Member Join Date: Jan 2005 Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA Posts: 2,097	Re: exhaust sound differences?? dumped mine behind the tires on my short bed and never had a resonance problem in the cab....

07-19-2011, 08:55 PM	#15
dukcaln Registered User Join Date: Jul 2011 Location: vacaville ca Posts: 1,304	Re: exhaust sound differences?? he thanks all, and I agree the flows are just loud. They would not be my first choice however they did come with the truck along with two 3 chamber flows..... so i am stuck with them cause I don't want to spend too much on the exhaust... __________________ 04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP *SOLD* 1972 chevy c10



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