Stock Exhaust Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*Zilverado* · 10-14-2003, 02:34 PM

So, my stock exhaust on my '86 (305) has a single pipe (approx 2.5" dia. - I didn't measure) coming off the y-pipe, through the cat and into the muffler. From the muffler it has two smaller tailpipes (approx 2") running to the back and out the side just behind the left rear tire. I assume they did this to "simulate" a dual exhaust?

I need to replace the muffler after one of the tailpipes actually rusted right off this last weekend (scared the crap out of me when it fell and hung there banging on my rotating u-joint until I could stop

). I have a fairly new muffler I took off my doner truck and have stored. The inlet pipe is the same size (I think), but it only has a single tailpipe.

So this "single" exhaust is fine with me. And I assume that the reduction to a single pipe should not be a performance issue - any thoughts?

Also, what do you guys do for exhaust hangers. The existing ones are in bad shape and likely in the wrong location anyway. I'll probably use strapping temporarily, but thought I'd get some thoughts here as well.

Thanks,

79BIG10 · 10-14-2003, 03:29 PM

You're right in that this was to simulate "true" dual exhaust. If you run 2.5" minimum out from the muffler you may notice a little difference but nothing to really hurt it. Just make sure to run the same size as a minimum. On the hanger my muffler shop used a flat piece of metal about 1/2"-3/4 " wide and bent the end to drill and mount a poly bushing to the frame. Then welded the other end to the pipe coming out of the muffler.

crackajacka · 10-15-2003, 10:36 AM

theres a guy around here that will run exhaust pipe to true dual exhaust for like 100 i think he does a good job he did mine ill post some pics if you want me 2

*Zilverado* · 10-15-2003, 01:38 PM

Thanks Crackajacka,

Thanks for the suggestion/offer, but my intent, at this time, is simply to put a single muffler and tailpipe on and get rid of the fake dual exhaust.

That's for now - who knows what the future holds...

**old Rusty C10** · 10-16-2003, 09:10 AM

my 86 had the same problem witht he exhaust i went to napa and got everything from the engine pipe back for $58. napa sells the bent pieces of metal that clip into the rubber pieces ont he frame and its held up by the exhaust clamps. oh yeah the pipe is 2 1/2" at the engine pipe and 2" after the muffler

Mike76251 · 10-16-2003, 11:10 AM

Autozone also has several types of hangers that work on our trucks.

KShortell · 10-16-2003, 11:46 AM

My Sub had a single pipe on it when I bought it. Running over a Jeep driveshaft on the Interstate a few years later meant getting a new exhaust. The shop put on a factory-style 2-pipe deal after the muffler. I didn't see any difference. However, when I put on a Flowmaster Delta Flow 3-chamber muffler about 3 years ago, I noticed a pickup in power-- and tone...

Kevin

*Zilverado* · 10-16-2003, 03:00 PM

Thanks for all the input Guys.

As I implied earlier, this repair is a "quick and dirty" solution for now (before our house move, and then parking the truck for the winter). I assume the exhaust system will need work at some point in the future, at which time, I may want to go with a better setup. But for now...

So I went out to Canadian Tire last night and picked up some pipe sections, clamps and the like to effect the repair. I noticed that they have a number of different after-market hangers in stock as well - so we'll see. This Saturday's project.

Thanks again.

10-14-2003, 02:34 PM	#1
Zilverado Account Suspended Join Date: Nov 2002 Location: Winnipeg, Manitoba, Canada Posts: 798	Stock Exhaust Questions So, my stock exhaust on my '86 (305) has a single pipe (approx 2.5" dia. - I didn't measure) coming off the y-pipe, through the cat and into the muffler. From the muffler it has two smaller tailpipes (approx 2") running to the back and out the side just behind the left rear tire. I assume they did this to "simulate" a dual exhaust? I need to replace the muffler after one of the tailpipes actually rusted right off this last weekend (scared the crap out of me when it fell and hung there banging on my rotating u-joint until I could stop ). I have a fairly new muffler I took off my doner truck and have stored. The inlet pipe is the same size (I think), but it only has a single tailpipe. So this "single" exhaust is fine with me. And I assume that the reduction to a single pipe should not be a performance issue - any thoughts? Also, what do you guys do for exhaust hangers. The existing ones are in bad shape and likely in the wrong location anyway. I'll probably use strapping temporarily, but thought I'd get some thoughts here as well. Thanks,

10-14-2003, 03:29 PM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	You're right in that this was to simulate "true" dual exhaust. If you run 2.5" minimum out from the muffler you may notice a little difference but nothing to really hurt it. Just make sure to run the same size as a minimum. On the hanger my muffler shop used a flat piece of metal about 1/2"-3/4 " wide and bent the end to drill and mount a poly bushing to the frame. Then welded the other end to the pipe coming out of the muffler. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

10-15-2003, 10:36 AM	#3
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	theres a guy around here that will run exhaust pipe to true dual exhaust for like 100 i think he does a good job he did mine ill post some pics if you want me 2 __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

10-16-2003, 09:10 AM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,345	my 86 had the same problem witht he exhaust i went to napa and got everything from the engine pipe back for $58. napa sells the bent pieces of metal that clip into the rubber pieces ont he frame and its held up by the exhaust clamps. oh yeah the pipe is 2 1/2" at the engine pipe and 2" after the muffler __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

10-16-2003, 11:46 AM	#7
KShortell Registered User Join Date: Oct 2003 Location: Chesapeake, VA Posts: 734	My Sub had a single pipe on it when I bought it. Running over a Jeep driveshaft on the Interstate a few years later meant getting a new exhaust. The shop put on a factory-style 2-pipe deal after the muffler. I didn't see any difference. However, when I put on a Flowmaster Delta Flow 3-chamber muffler about 3 years ago, I noticed a pickup in power-- and tone... Kevin __________________ Semper Paratus

10-15-2003, 01:38 PM	#4
Zilverado Account Suspended Join Date: Nov 2002 Location: Winnipeg, Manitoba, Canada Posts: 798	Thanks Crackajacka, Thanks for the suggestion/offer, but my intent, at this time, is simply to put a single muffler and tailpipe on and get rid of the fake dual exhaust. That's for now - who knows what the future holds...

10-16-2003, 11:10 AM	#6
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	Autozone also has several types of hangers that work on our trucks.

10-16-2003, 03:00 PM	#8
Zilverado Account Suspended Join Date: Nov 2002 Location: Winnipeg, Manitoba, Canada Posts: 798	Thanks for all the input Guys. As I implied earlier, this repair is a "quick and dirty" solution for now (before our house move, and then parking the truck for the winter). I assume the exhaust system will need work at some point in the future, at which time, I may want to go with a better setup. But for now... So I went out to Canadian Tire last night and picked up some pipe sections, clamps and the like to effect the repair. I noticed that they have a number of different after-market hangers in stock as well - so we'll see. This Saturday's project. Thanks again.



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