4x4 duel exhaust - The 1947 - Present Chevrolet & GMC Truck Message Board Network

xshadow · 08-14-2007, 10:01 PM

does anyone have pics of how there running there dual exhaust? how do you get by the transfer case and cross member?

msgross · 08-14-2007, 10:19 PM

The one's I have seen goes over the T-Case on the pass side. Mine had single exhaust with a Y off the engine originally....

1969k10stepside · 08-14-2007, 11:57 PM

On my shorty,the exhaust runs between the t-case and frame on both sides straight back to the rear bumper and exit under the license plate...Too bad it won't work with my new headers..I think I'll just put the manifolds back on.Also,it had a newer t-case and didnt use the torque mount on the passenger side so it was easier to put the exhaust through there..

**kwmech** · 08-15-2007, 12:03 AM

Much easier to run a 3'' single.

Blue_71 · 08-15-2007, 01:03 AM

i went with ram horns and 2 1/4" single

msgross · 08-15-2007, 07:48 AM

I'm gonna run my ramhorns and maybe a dual exit muffler, then have dual pipes.... i'll leave it up to my muffler shop and $$

Blazer1970 · 08-15-2007, 07:59 AM

I have dual 2 1/2 and it goes over the t-case on the pass. side. There is not a lot of room in there and I am sure it transfers quite a bit of heat into the 205. You need an exhaust guy that is a pretty good bender to get the pipes where they need to be.

**Yukon Jack** · 08-15-2007, 10:47 AM

This is the system I have on my 69 K20 that has a bit of a body lift and is running a bbc. The exhaust was installed by American Muffler in Wichita, KS. From the Dynomax headers it uses 3" pipe to the x-pipe, then 2 1/2" pipe to Dynomax UltraFlo's and continues as 2 1/2" pipe dumping at the rear of the flatbed angled down slightly.

Here are some pics of the system. This is the X-pipe that I had built by someone I found on E-bay.

Rather than use the collector piece that came with the headers, American Muffler made their own piece

The passenger side collector was fairly close to the transfer case. Here is a pic of the pipe coming over the transfer case

Here is the X-pipe installed directly behind the transfer case

And here is an example of the welds at the X-pipe

**Yukon Jack** · 08-15-2007, 10:48 AM

Here are the Dynomax mufflers

Pretty straight shot to the rear of the truck

The pipes dumb right before the hitch and are well protected

OLDCHEV4X4 · 08-15-2007, 10:55 AM

I have 2.5 tubing that goes over the crossmember on the driver side, and over the crossmember/transfer case on the passinger side. If you are using headers, look at the clearance between the pass side collector and the front, rear spring shackle. Its real close. I had to turn my bolt around cause it was hitting.

theside00 · 08-15-2007, 01:55 PM

I just ran mine over the transfer case then dumps out right before the rear axle. Dont have pics right now of what it looks like but it isnt very pretty kind of rusty. Yukon Jack has a nice system and I would copy that one if I could

**special-K** · 08-15-2007, 02:33 PM

I`ve been running headers and dual exhaust on every 67-72 4wd I`ve owned and didn`t know there was supposed to be a problem doing it.I`ve never seen heat affect my t-case,the pipes run over the t-case crossmember/next to t-case/inside frame.I have pipes made with the offset needed and weld the header bell flanges on.I bolt those on with mufflers and drive to the custom exhaust shop.The exhaust guy pulls that off and starts bending using the pieces I had on the truck.

Jim85IROC · 08-16-2007, 02:30 PM

I 2.5" true duals that were bent up by a local exhaust shop. None of it looks particularly difficult on my truck. The pipes run on their respective sides between the transfer case and the frame. It's a bit snug on the driver side in a couple spots. Once past the transfer case it's a straight shot until they go over the axles, then out the sides behind the tires. It's about to fall off so I need to get it redone, and this time I'm going to have them build it in sections so I don't have to cut it to work on the truck, and also want them straight out the back.

My truck is an 87 with a 454, TH400 and NP205 transfer case. The exhaust tucks up nicely and is not lower than the frame at any point except where it exits the truck. I don't have a body lift.

Spanky_Pete · 08-16-2007, 03:15 PM

The '68 K10 I'm starting to tear down had headers and duals on it. They routed the pipes around the transfer case. Looks like there was plenty of clearance.

The pipes look like they're sitting on it in this photo because the engine has been pulled.

Goplay2 · 08-17-2007, 01:29 AM

here is mine
http://67-72chevytrucks.com/vboard/s...d.php?t=161008

08-14-2007, 10:01 PM	#1
xshadow Registered User Join Date: Apr 2006 Location: va Posts: 553	4x4 duel exhaust does anyone have pics of how there running there dual exhaust? how do you get by the transfer case and cross member?

08-14-2007, 10:19 PM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 4x4 duel exhaust The one's I have seen goes over the T-Case on the pass side. Mine had single exhaust with a Y off the engine originally.... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

08-14-2007, 11:57 PM	#3
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: 4x4 duel exhaust On my shorty,the exhaust runs between the t-case and frame on both sides straight back to the rear bumper and exit under the license plate...Too bad it won't work with my new headers..I think I'll just put the manifolds back on.Also,it had a newer t-case and didnt use the torque mount on the passenger side so it was easier to put the exhaust through there.. Last edited by 1969k10stepside; 08-14-2007 at 11:58 PM.

08-15-2007, 12:03 AM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,717	Re: 4x4 duel exhaust Much easier to run a 3'' single.

08-15-2007, 07:48 AM	#6
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 4x4 duel exhaust I'm gonna run my ramhorns and maybe a dual exit muffler, then have dual pipes.... i'll leave it up to my muffler shop and $$ __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 08-15-2007 at 09:14 AM.

08-15-2007, 07:59 AM	#7
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	Re: 4x4 duel exhaust I have dual 2 1/2 and it goes over the t-case on the pass. side. There is not a lot of room in there and I am sure it transfers quite a bit of heat into the 205. You need an exhaust guy that is a pretty good bender to get the pipes where they need to be. __________________ Tim

08-15-2007, 10:47 AM	#8
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,689	Re: 4x4 duel exhaust This is the system I have on my 69 K20 that has a bit of a body lift and is running a bbc. The exhaust was installed by American Muffler in Wichita, KS. From the Dynomax headers it uses 3" pipe to the x-pipe, then 2 1/2" pipe to Dynomax UltraFlo's and continues as 2 1/2" pipe dumping at the rear of the flatbed angled down slightly. Here are some pics of the system. This is the X-pipe that I had built by someone I found on E-bay. Rather than use the collector piece that came with the headers, American Muffler made their own piece The passenger side collector was fairly close to the transfer case. Here is a pic of the pipe coming over the transfer case Here is the X-pipe installed directly behind the transfer case And here is an example of the welds at the X-pipe __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

08-15-2007, 10:48 AM	#9
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,689	Re: 4x4 duel exhaust Here are the Dynomax mufflers Pretty straight shot to the rear of the truck The pipes dumb right before the hitch and are well protected __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

08-15-2007, 10:55 AM	#10
OLDCHEV4X4 Registered User Join Date: Apr 2000 Location: Chester County PA, USA Posts: 1,228	Re: 4x4 duel exhaust I have 2.5 tubing that goes over the crossmember on the driver side, and over the crossmember/transfer case on the passinger side. If you are using headers, look at the clearance between the pass side collector and the front, rear spring shackle. Its real close. I had to turn my bolt around cause it was hitting. __________________ 72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania

08-15-2007, 01:55 PM	#11
theside00 Registered User Join Date: Jun 2007 Location: Seattle WA Posts: 38	Re: 4x4 duel exhaust I just ran mine over the transfer case then dumps out right before the rear axle. Dont have pics right now of what it looks like but it isnt very pretty kind of rusty. Yukon Jack has a nice system and I would copy that one if I could

08-15-2007, 02:33 PM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 4x4 duel exhaust I`ve been running headers and dual exhaust on every 67-72 4wd I`ve owned and didn`t know there was supposed to be a problem doing it.I`ve never seen heat affect my t-case,the pipes run over the t-case crossmember/next to t-case/inside frame.I have pipes made with the offset needed and weld the header bell flanges on.I bolt those on with mufflers and drive to the custom exhaust shop.The exhaust guy pulls that off and starts bending using the pieces I had on the truck. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 08-15-2007 at 02:34 PM.

08-16-2007, 02:30 PM	#13
Jim85IROC Registered User Join Date: Dec 2004 Location: Readsboro, VT Posts: 502	Re: 4x4 duel exhaust I 2.5" true duals that were bent up by a local exhaust shop. None of it looks particularly difficult on my truck. The pipes run on their respective sides between the transfer case and the frame. It's a bit snug on the driver side in a couple spots. Once past the transfer case it's a straight shot until they go over the axles, then out the sides behind the tires. It's about to fall off so I need to get it redone, and this time I'm going to have them build it in sections so I don't have to cut it to work on the truck, and also want them straight out the back. My truck is an 87 with a 454, TH400 and NP205 transfer case. The exhaust tucks up nicely and is not lower than the frame at any point except where it exits the truck. I don't have a body lift. __________________ 1987 GMC Sierra Classic 3500 454 TH400 My Sounddomain Page

08-16-2007, 03:15 PM	#14
Spanky_Pete Too many trucks? Nah... Join Date: Mar 2002 Location: SW Washington State Posts: 154	Re: 4x4 duel exhaust The '68 K10 I'm starting to tear down had headers and duals on it. They routed the pipes around the transfer case. Looks like there was plenty of clearance. The pipes look like they're sitting on it in this photo because the engine has been pulled. Attached Images

08-17-2007, 01:29 AM	#15
Goplay2 Registered User Join Date: Oct 2004 Location: Dallas, TX Posts: 104	Re: 4x4 duel exhaust here is mine http://67-72chevytrucks.com/vboard/s...d.php?t=161008



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