Where to mount mufflers? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shortbed70 · 12-05-2004, 09:32 PM

Does anyone have any feedback on mounting the mufflers under the cab? I plan on running the exhaust out the bedside in front of the tires on both sides. I am running 2 1/2" pipe through the frame and want to mount 40 series flowmasters between the tranny and frame. What is your opinion?

*Randy70C-10* · 12-05-2004, 09:47 PM

Wow, that's "exactly" what I did, 40 series Flowmasters, 2 1/2 pipes the same exact way. My Flowmasters are about 12 inches behind the header flanges.

race-n-jason · 12-05-2004, 11:12 PM

Just got done re-routing my exhaust. I love the sound of flowmasters, however, when mounted just beneath the cab, the sound resonates inside the cab. Gets old really fast. I ended up mounting mine underneath the bed, and dumping infront of the rear end. Sound perfect. Rumbles really well, but doesn't echo inside the cab.....

Go to this thread....
http://67-72chevytrucks.com/vboard/s...=exhaust+comin

Brainchild · 12-05-2004, 11:16 PM

Quote:

Originally Posted by race-n-jason

Just got done re-routing my exhaust. I love the sound of flowmasters, however, when mounted just beneath the cab, the sound resonates inside the cab. Gets old really fast. I ended up mounting mine underneath the bed, and dumping infront of the rear end. Sound perfect. Rumbles really well, but doesn't echo inside the cab.....

Go to this thread....
http://67-72chevytrucks.com/vboard/s...=exhaust+comin

That would be my sugestion,Move them behind the cab.I'm running mufflers right under the cab now too,and it gets really old yelling at the person in the passenger side,or maybe I'm too old to enjoy that kind of noise anymore.

gmc67swb · 12-05-2004, 11:23 PM

race-n-jason how does that big block run.

Longhorn Man · 12-05-2004, 11:36 PM

under the cab does get old pretty quick. Esp if you do any road trips.

Ear plugs should not be maditory for doing over 60 MPH.

Plus,a little known minor fact, the exhaust is less restrictive when you place the mufflers further back. Also, turn downs are not a good idea, the exhaust is corrosive and is not good for the sheetmetal...not to mention, poverty pipes simply suck.

70c10 · 12-06-2004, 12:01 AM

Come on Andy, ther'e's nothing like the sound of turndowns bouncing off the pavement

. The only thing is they kick up alot of dust

. I like it loud

Longhorn Man · 12-06-2004, 12:07 AM

loud is one thing...annoying as a complete other thing.
I honestly prefered open headers to under cab mufflers.
At least with open headers, you don't even try to talk to your passengers.

shortbed70 · 12-06-2004, 12:14 AM

I'mnot talking about pipes under the bed side I mean through the bed side in front of the wheel. Read the post. I know it will be noisy but the truck is not a daily driver. I plan on putting ALOT of sound deadening material in the cab anyways. It has a 25.5" talltire and 3.73 rear so highway driving is noisey already add a PJ geardrive and 40 years of use and I'll take what I can get. Thanks for the replies. Randy how do you like the sound of your setup?

Longhorn Man · 12-06-2004, 01:03 AM

I was kinda addressing your question, and the turn down idea listed in this thread at the same time.
I read it twice before responding.

12-05-2004, 09:32 PM	#1
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Where to mount mufflers? Does anyone have any feedback on mounting the mufflers under the cab? I plan on running the exhaust out the bedside in front of the tires on both sides. I am running 2 1/2" pipe through the frame and want to mount 40 series flowmasters between the tranny and frame. What is your opinion? __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

12-05-2004, 11:12 PM	#3
race-n-jason -Praise the Lowered- Join Date: Oct 2001 Location: Garland, Tx, USA Posts: 280	Just got done re-routing my exhaust. I love the sound of flowmasters, however, when mounted just beneath the cab, the sound resonates inside the cab. Gets old really fast. I ended up mounting mine underneath the bed, and dumping infront of the rear end. Sound perfect. Rumbles really well, but doesn't echo inside the cab..... Go to this thread.... http://67-72chevytrucks.com/vboard/s...=exhaust+comin __________________ Race-N-Jason ('71 Chevy C-10 LWB 454/TH350) ('07 Dodge Ram 2500, 5.9 Cummins/6-speed Manual)

12-05-2004, 11:23 PM	#5
gmc67swb Registered User Join Date: Feb 2003 Location: Mesquite, Tx Posts: 396	race-n-jason how does that big block run. __________________ GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd

12-06-2004, 12:01 AM	#7
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Come on Andy, ther'e's nothing like the sound of turndowns bouncing off the pavement . The only thing is they kick up alot of dust . I like it loud __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

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12-05-2004, 09:47 PM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Wow, that's "exactly" what I did, 40 series Flowmasters, 2 1/2 pipes the same exact way. My Flowmasters are about 12 inches behind the header flanges.

12-05-2004, 11:36 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	under the cab does get old pretty quick. Esp if you do any road trips. Ear plugs should not be maditory for doing over 60 MPH. Plus,a little known minor fact, the exhaust is less restrictive when you place the mufflers further back. Also, turn downs are not a good idea, the exhaust is corrosive and is not good for the sheetmetal...not to mention, poverty pipes simply suck.

12-06-2004, 12:07 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	loud is one thing...annoying as a complete other thing. I honestly prefered open headers to under cab mufflers. At least with open headers, you don't even try to talk to your passengers.

12-06-2004, 12:14 AM	#9
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	I'mnot talking about pipes under the bed side I mean through the bed side in front of the wheel. Read the post. I know it will be noisy but the truck is not a daily driver. I plan on putting ALOT of sound deadening material in the cab anyways. It has a 25.5" talltire and 3.73 rear so highway driving is noisey already add a PJ geardrive and 40 years of use and I'll take what I can get. Thanks for the replies. Randy how do you like the sound of your setup?

12-06-2004, 01:03 AM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I was kinda addressing your question, and the turn down idea listed in this thread at the same time. I read it twice before responding.



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