exhaust exit preference??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

prg machine · 06-21-2008, 10:22 PM

I was wondering what opinions there might be as far as the exit point for dual exhaust for performance, sound, etc. for the following:

old school hot rod style/ tail pipes dump straight down after exiting mufflers and dump underneath the bed....simple set up

side exit in front of rear wheels

traditional rear corner exit

also is there any real difference in the size of tail pipe after the mufflers??

redhead69 · 06-21-2008, 10:50 PM

My exit points have always been determined by the amount of work I want to do. My truck now has duals that turn out in front of the rear tires.. real easy. Now what I want to do is run them threw the rear crossmember and straight out the back.. but more cutting and fitting is involved along with more material.

Heres some good reading on exhaust
http://www.superchevy.com/technical/...exh/index.html

1969k10stepside · 06-21-2008, 10:55 PM

I always liked them either at a 90* bend and out behind the rear wheels or 45*s out behind the rear wheels,I like the echo with 3" or so angle tips tips when it echos off guardrails and buildings.

GREASEMONKEY72 · 06-21-2008, 11:49 PM

i prefer them to dump out infront of the axle

chevjayfsd · 06-22-2008, 12:51 AM

Side before tires is my preference..

**67 cst swb** · 06-22-2008, 02:41 AM

Dump out just outta the muffler under the truck, before the axle.
It does stir up dust, but there are no tailpipes hanging out killing the look of the truck.

petey-pablo · 06-22-2008, 05:22 AM

[QUOTE=chevjayfsd;2775893]Side before tires is my preference..

It just sounds good when you rev it up next to someone's window here's a small clip of my single Exhaust idling!

prairewolf · 06-22-2008, 06:40 AM

Now that you mention it,..... on a truck I think the old school way in front of rear axle exhaust tips down, on my sub I like behind rear tires exit out the side, just because of possible fumes getting into interior,........ there was a 1970's car movie I remember part of, I think it was a purple 68 or something Road Runner, the guy had the exhaust piped into his interior, I think he got pulled over by the Law, he stumbled out laughing and opened the trunk, and a bunch of chickens jumped out.... something wierd like that.

but for performance, there has to be a '' Sweet spot '' for the length of exhaust, .... the right length for a specific engine for best HP and Mpg.
it is all in the back presssure somewhere I bet.

kent

bad6772 · 06-22-2008, 08:04 AM

Hidden IMO..i have never seen a way they exited that i liked..........

LONGHAIR · 06-22-2008, 08:27 AM

Just running out of the mufflers under the bed can cause an annoying rumble/resonance.

Angled in front of the rear tires is my choice, most of the time.

PanelDeland · 06-22-2008, 08:32 AM

I like them run all the way out the rear.I just think it gives the truck a more balanced sound from the drivers seat where I spend most of my time while it's running.

HomerJ · 06-22-2008, 08:51 AM

I've always liked the look of them all the way out the back, with chrome/polished stainless tips. I'm thinking of going that route, but I am concerned about clearance when I take my truck out in the woods. Having all those bends to clear the axle probably doesn't help in terms flow/backpressure, either. Still, it's the "look" that I like.

As for performance, redhead69 has pointed you in the best direction, IMHO. I have been a big fan of David Vizard for his technical expertise (mainly because he backs up everything he says with dyno testing - not wild claims or estimates).

HomerJ

**Boog** · 06-22-2008, 10:29 AM

Quote:

Originally Posted by prairewolf

Now that you mention it,..... on a truck I think the old school way in front of rear axle exhaust tips down, on my sub I like behind rear tires exit out the side, just because of possible fumes getting into interior,........ there was a 1970's car movie I remember part of, I think it was a purple 68 or something Road Runner, the guy had the exhaust piped into his interior, I think he got pulled over by the Law, he stumbled out laughing and opened the trunk, and a bunch of chickens jumped out.... something wierd like that.

but for performance, there has to be a '' Sweet spot '' for the length of exhaust, .... the right length for a specific engine for best HP and Mpg.
it is all in the back presssure somewhere I bet.

kent

Kent that scene may have been in the Eastwood movie Thunderbolt and Lightfoot. It sounds familiar.
And I think you can't go wrong with running the pipes out the back, either straight or angled down.

Arad68 · 06-22-2008, 11:31 AM

I like the hidden or "tucked" exhaust as well exiting behind the rear tires at 45 or 90 degree angle.

gator2511 · 06-22-2008, 11:53 AM

I like mine out the back. Exhaust isn't noise, its music.

straitnate14 · 06-22-2008, 01:23 PM

caminokid · 06-22-2008, 03:29 PM

I used to be one that would exit out past the back bumper...but here lately I have been liking it behind the tires.

JAKES 68GMC · 06-22-2008, 07:19 PM

I have mine turned down after the rear axle with 3 1/2" tips. I like it, the Thrush turbos dont rumble enough for me though.

67_C-30 · 06-22-2008, 10:11 PM

Quote:

Originally Posted by bad6772

Hidden IMO..i have never seen a way they exited that i liked..........

X2!!!

JayDubBlazer · 06-22-2008, 10:23 PM

empty behind the wheel. I had them straight back on an older blazer and with the top off I was sucking to much exhaust back into the tub.

jugernot · 06-22-2008, 10:25 PM

I agree with above. Exit behind the rear wheels

samwise68 · 06-22-2008, 10:26 PM

I like mine out in front of the rear tires. It isn't under the bed to resonate, and it really isn't THAT loud, given mine is just glasspacks off of headers and 2 inch pipes.

It was simple, fairly straight forward and easy, and cheap. Which is what I was going for at the time, and would still go for. I have no regrets with the way it sounds, and have been complimented a couple times since apparently no one runs glasspacks anymore and it's "distinctive".

Oh, and you can't be running through a tunnel, punching the clutch, and blapping the throttle a couple times to have those tunes walk up the walls, haha.

-Sam.

68alltheway · 06-22-2008, 10:36 PM

i prefer turn downs after the before the axle. as long as you don't live down a dusty road. although it does look cool when you rev it up on a dusty road.

IvelDesigns · 06-23-2008, 12:53 AM

funny someone brought this up... I was just out in the garage today trying to figure out if/how/where i want my tail pipes to go. right now they are already over the axle and following the frame rail, but i never put the actual tail pipes on. Well, after dicking around with it for a few min, i think i'm gonna leave them as is. hidden under the bed, nothing sticking out.

it's a shame though. I kinda want to show off the work my uncle did getting them over the axle, and out the back, while working around bags, gas tank, air tank, compressor and shocks.

original_balzer · 06-23-2008, 01:45 AM

I have been a 4X4 guy all my life. So in front of the wheels, or behind the wheels ect. just collected mud, or got crushed on logs or rocks. I have always run exhaust straight out the back with 4"x24"or18" 45* cut chrome tips, I kept them slightly ahead of the rear bumper to keep them from being crushed on the departure angle, and about as wide as the reciever hitch frame.

I had an old caprice classic once, that exited just in front of the rear tires. That car always ran rich so it usualy had soot on my rear chrome reverse smoothies with baby moons. To fix that I put chrome turn down tips on it. Then later I rebuilt the carb.

Long winded responce cut short, I think I will go with sidepipes on my 67. Personal prefrence is what realy matters. Since I have always wanted a vehicle with suicide doors and side pipes, and I love 67-72 chevy pickups Im putting everything I like into this truck. I dont realy care if everyone likes it, as long as I like it, it dont matter what anyone else thinks.

Bottom line is no matter how you build a truck some people will love it and some people will hate it.

06-21-2008, 10:22 PM	#1
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	exhaust exit preference??? I was wondering what opinions there might be as far as the exit point for dual exhaust for performance, sound, etc. for the following: old school hot rod style/ tail pipes dump straight down after exiting mufflers and dump underneath the bed....simple set up side exit in front of rear wheels traditional rear corner exit also is there any real difference in the size of tail pipe after the mufflers?? Attached Images __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

06-21-2008, 10:50 PM	#2
redhead69 fugedaboutit Join Date: Mar 2005 Location: Gresham, OR Posts: 832	Re: exhaust exit preference??? My exit points have always been determined by the amount of work I want to do. My truck now has duals that turn out in front of the rear tires.. real easy. Now what I want to do is run them threw the rear crossmember and straight out the back.. but more cutting and fitting is involved along with more material. Heres some good reading on exhaust http://www.superchevy.com/technical/...exh/index.html __________________ Currently truckless

06-21-2008, 10:55 PM	#3
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: exhaust exit preference??? I always liked them either at a 90* bend and out behind the rear wheels or 45*s out behind the rear wheels,I like the echo with 3" or so angle tips tips when it echos off guardrails and buildings.

06-21-2008, 11:49 PM	#4
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: exhaust exit preference??? i prefer them to dump out infront of the axle __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

06-22-2008, 12:51 AM	#5
chevjayfsd Project 7dos Join Date: Aug 2001 Location: Abilene, Texas Posts: 876	Re: exhaust exit preference??? Side before tires is my preference.. __________________ 7DOS - 1972 C-10 350/350 Porterbuilt/Accuair 20x8.5/20x10 Ride Low or Die PSSST - Yes it's bagged. 7dos build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=610290

06-22-2008, 02:41 AM	#6
67 cst swb Senior Member Join Date: Nov 2001 Location: Rapid City, SD Posts: 2,281	Re: exhaust exit preference??? Dump out just outta the muffler under the truck, before the axle. It does stir up dust, but there are no tailpipes hanging out killing the look of the truck. __________________ My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White Last edited by 67 cst swb; 06-22-2008 at 02:42 AM.

06-22-2008, 05:22 AM	#7
petey-pablo "THE GREEN GOBLIN" Join Date: Mar 2008 Location: Fremont Ca. Posts: 1,025	Re: exhaust exit preference??? [QUOTE=chevjayfsd;2775893]Side before tires is my preference.. It just sounds good when you rev it up next to someone's window here's a small clip of my single Exhaust idling! __________________ Petey-pablo "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi Sold Drive it like you stole it! Petey-pablo@sbcglobal.net Last edited by petey-pablo; 06-22-2008 at 05:26 AM.

06-22-2008, 06:40 AM	#8
prairewolf Registered User Join Date: Oct 2005 Location: south dakota Posts: 1,895	Re: exhaust exit preference??? Now that you mention it,..... on a truck I think the old school way in front of rear axle exhaust tips down, on my sub I like behind rear tires exit out the side, just because of possible fumes getting into interior,........ there was a 1970's car movie I remember part of, I think it was a purple 68 or something Road Runner, the guy had the exhaust piped into his interior, I think he got pulled over by the Law, he stumbled out laughing and opened the trunk, and a bunch of chickens jumped out.... something wierd like that. but for performance, there has to be a '' Sweet spot '' for the length of exhaust, .... the right length for a specific engine for best HP and Mpg. it is all in the back presssure somewhere I bet. kent

06-22-2008, 08:04 AM	#9
bad6772 Official Site Guitar Shredder Join Date: May 2006 Location: Oz Posts: 3,955	Re: exhaust exit preference??? Hidden IMO..i have never seen a way they exited that i liked..........

06-22-2008, 08:27 AM	#10
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Re: exhaust exit preference??? Just running out of the mufflers under the bed can cause an annoying rumble/resonance. Angled in front of the rear tires is my choice, most of the time.

06-22-2008, 08:32 AM	#11
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: exhaust exit preference??? I like them run all the way out the rear.I just think it gives the truck a more balanced sound from the drivers seat where I spend most of my time while it's running. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

06-22-2008, 08:51 AM	#12
HomerJ Registered User Join Date: Apr 2007 Location: Norman, OK Posts: 222	Re: exhaust exit preference??? I've always liked the look of them all the way out the back, with chrome/polished stainless tips. I'm thinking of going that route, but I am concerned about clearance when I take my truck out in the woods. Having all those bends to clear the axle probably doesn't help in terms flow/backpressure, either. Still, it's the "look" that I like. As for performance, redhead69 has pointed you in the best direction, IMHO. I have been a big fan of David Vizard for his technical expertise (mainly because he backs up everything he says with dyno testing - not wild claims or estimates). HomerJ __________________ 67 C-10 LWB "Cow-butt-spotted" (neighbor's term) - work in progress. 350/TH400/3.73 67 Chevelle SS Clone 454/TH400/3.73

06-22-2008, 11:31 AM	#14
Arad68 Trucks N Tranzams Join Date: Dec 2002 Location: North Las Vegas, Nevada Posts: 816	Re: exhaust exit preference??? I like the hidden or "tucked" exhaust as well exiting behind the rear tires at 45 or 90 degree angle. __________________ Don '68 Chevy LB 383 TH400/GV/373 posi '56 Chevy 4WD SWB '64 Chevy short stepside '79 Trans Am 455/TH2004R/12blt/4whldisc 95 Kia (Wifes car) 2002 S-10 extended cab pickup "God punishes small sins immediately"

06-22-2008, 11:53 AM	#15
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Re: exhaust exit preference??? I like mine out the back. Exhaust isn't noise, its music. Last edited by gator2511; 06-22-2008 at 11:56 AM.

06-22-2008, 01:23 PM	#16
straitnate14 Registered User Join Date: Feb 2008 Location: Bartonville IL Posts: 415	Re: exhaust exit preference??? __________________ ΜΟΛΩΝ ΛΑΒΕ



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06-22-2008, 03:29 PM	#17
caminokid Chevy nut Join Date: Jun 2007 Location: Springfield, Illinois Posts: 2,266	Re: exhaust exit preference??? I used to be one that would exit out past the back bumper...but here lately I have been liking it behind the tires. __________________ 84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!"

06-22-2008, 07:19 PM	#18
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,212	Re: exhaust exit preference??? I have mine turned down after the rear axle with 3 1/2" tips. I like it, the Thrush turbos dont rumble enough for me though.

06-22-2008, 10:23 PM	#20
JayDubBlazer go cyclones Join Date: Jun 2003 Location: Ames, IA Posts: 1,885	Re: exhaust exit preference??? empty behind the wheel. I had them straight back on an older blazer and with the top off I was sucking to much exhaust back into the tub. __________________ Wes PROJECT OLE GREEN 1972 Blazer 4X4 350/700R4 2017 Silverado LT

06-22-2008, 10:25 PM	#21
jugernot Life, Be In It..... Join Date: Oct 2003 Location: Novato, California Posts: 1,498	Re: exhaust exit preference??? I agree with above. Exit behind the rear wheels __________________ Project Name: LEMON DROP. Reconstruction started "December 2000". Projected completion date "Who knows" http://67-72chevytrucks.com/vboard/s...d.php?t=200082

06-22-2008, 10:36 PM	#23
68alltheway drive it till it dies Join Date: Apr 2007 Location: Larose, LA Posts: 274	Re: exhaust exit preference??? i prefer turn downs after the before the axle. as long as you don't live down a dusty road. although it does look cool when you rev it up on a dusty road. __________________ live life to the fullest

06-23-2008, 12:53 AM	#24
IvelDesigns Commander Taco Bello Join Date: Sep 2006 Location: Des Moines, Iowa Posts: 2,232	Re: exhaust exit preference??? funny someone brought this up... I was just out in the garage today trying to figure out if/how/where i want my tail pipes to go. right now they are already over the axle and following the frame rail, but i never put the actual tail pipes on. Well, after dicking around with it for a few min, i think i'm gonna leave them as is. hidden under the bed, nothing sticking out. it's a shame though. I kinda want to show off the work my uncle did getting them over the axle, and out the back, while working around bags, gas tank, air tank, compressor and shocks. __________________ Bagged '50 3600 - Bumper punchin' road kill since 2009... Bagged '69 C10 Longbed - Bumper punchin' road kill since 2007...

06-23-2008, 01:45 AM	#25
original_balzer Registered User Join Date: May 2008 Location: roosevelt utah Posts: 325	Re: exhaust exit preference??? I have been a 4X4 guy all my life. So in front of the wheels, or behind the wheels ect. just collected mud, or got crushed on logs or rocks. I have always run exhaust straight out the back with 4"x24"or18" 45* cut chrome tips, I kept them slightly ahead of the rear bumper to keep them from being crushed on the departure angle, and about as wide as the reciever hitch frame. I had an old caprice classic once, that exited just in front of the rear tires. That car always ran rich so it usualy had soot on my rear chrome reverse smoothies with baby moons. To fix that I put chrome turn down tips on it. Then later I rebuilt the carb. Long winded responce cut short, I think I will go with sidepipes on my 67. Personal prefrence is what realy matters. Since I have always wanted a vehicle with suicide doors and side pipes, and I love 67-72 chevy pickups Im putting everything I like into this truck. I dont realy care if everyone likes it, as long as I like it, it dont matter what anyone else thinks. Bottom line is no matter how you build a truck some people will love it and some people will hate it.

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