did 86 trucks come with true duals or a y pip set up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shrtbx · 02-13-2007, 03:59 AM

Did 1986 chevy trucks come with a true dual exhause with 2 cats. Or a single y pipe set up. The guy i bought the truck from just has separate pipes from each manifold going to two cheap mufflers.

ocbaud · 02-13-2007, 09:08 AM

stock they came with 2 cats and a Y pipe setup with the pipe exiting on the side behind the passanger rear tire.

i believe thats how it is.

ElGracho · 02-13-2007, 09:26 AM

1/2 or 3/4 with light duty emissions, v8 gas engine - Single exhaust with two pipes from muffler back both exiting driver's side (not passenger).

3/4 or 1 ton with heavy duty emissions (no cats) duals with exits on both sides.

Diesels - duals exiting each side.

Malo83 · 02-13-2007, 03:46 PM

Gracho is right on ,Y-pipe to single exhaust, my 83 came that way and I would run the true dual exhaust like you described, had a friend of mine pull the exhaust pipe at the manifolds and run duals with 40 series Flows, when it came time to smog I would throw the original exhaust back up, the older I got the more of a hassle it became so now i'm running a single 3" exhaust with a 3" cat and 3'' in and dual 2.5 out Flowmaster dumped in front of the axel

John

Duro5341 · 02-13-2007, 05:38 PM

Quote:

Originally Posted by shrtbx

Did 1986 chevy trucks come with a true dual exhause with 2 cats. Or a single y pipe set up. The guy i bought the truck from just has separate pipes from each manifold going to two cheap mufflers.

2WD, or 4WD....?

My 86 4X4 came with 350 HD emissions, had a y-pipe with 1 cat, and single outlet on drivers side, behind rear wheel

Duro

piecesparts · 02-13-2007, 07:18 PM

My truck 84 GMC Sierra Classic and the son's 86 Silverado came with a "Y" pipe and a single catalytic convertor under the passenger side. This went to a single muffler and then out the passenger side at the rear fender. That did not last long in my world. There are headers, a connection underneath to a "H" pipe and then to dual Flowmaster mufflers and out the back through "MEGS" stainless tips. We don't have smoggies here.

The upgrade would be to use a "X" crossover pipe, rather than the "H" design, but I will wait for old age to take out the pipe first.

shrtbx · 02-13-2007, 08:40 PM

whats a good set up smog legal headers for california.

**swervin ervin** · 02-13-2007, 08:45 PM

I don't think any of our trucks that came with a cat had the cat on the passenger side. I know my 85 came with a y-pipe and the cat was on the drivers side.

**N2TRUX** · 02-13-2007, 10:23 PM

Quote:

Originally Posted by swervin ervin

I don't think any of our trucks that came with a cat had the cat on the passenger side. I know my 85 came with a y-pipe and the cat was on the drivers side.

I can't vouch for the later trucks but that makes sense. The frame has a "flare" in it to accomodate the cat on the drivers side. I don't think they ever changed that.

87 STEPPER · 02-14-2007, 08:15 AM

I bought an '85 new and it was set up as a Y pipe into a single cat and then into a muff and dual out and exit the driver side.

I also bought my '87 new and it was exactlly the same set up as the '85.

So i don't think Chevy would of changed the entire exhaust system for one year and put it on the other side or as dual set up.

piecesparts · 02-14-2007, 12:10 PM

My son's truck and mine both were on the passenger side. I know this very well, since I had to remove all of the damnable metal shielding along with the cat in my changes to the trucks.

Hoods69BadBowTie · 02-14-2007, 09:35 PM

True duals is the only way to roll. Got no smog testing up here so nothing to worry about.

87 STEPPER · 02-16-2007, 11:06 AM

Quote:

Originally Posted by piecesparts

My son's truck and mine both were on the passenger side. I know this very well, since I had to remove all of the damnable metal shielding along with the cat in my changes to the trucks.

What years are they?

piecesparts · 02-16-2007, 05:54 PM

Quote:

Originally Posted by 87 STEPPER

What years are they?

Mine is an 84 GMC Sierra Classic SWB and his is an 86 Cnevy Silverado SWB.

Curly86 · 02-16-2007, 07:51 PM

My 86 Silverado has got a Y pipe no cat goes into muff and comes out dual and one pipe goes out each side

MylilBowTie · 02-16-2007, 08:25 PM

Everyone I have seen that was stock. Has the manifolds, y pipe, then catalytic convertor on the driverside, intermediate pipe, over the axle pipe and then muffler with dual tail pipes on the driverside.

I did seen a hd 3/4 ton. It has stainless steel manifold but more like shorty headers, dual pipes down each side, not catalytic convertors, two mufflers, tail pipes 90ed behind the tires.

84 400 · 02-16-2007, 09:41 PM

On my 85 it was Y pipe, then ran dowm the drivers side into a cat and then a muffler and then exit in two pipes coming out be hind the drivers side rear tire. That was stock.
on my 84 the y pipe and pipe ran down the passangerside into a cat then a muffler.

02-13-2007, 03:59 AM	#1
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	did 86 trucks come with true duals or a y pip set up Did 1986 chevy trucks come with a true dual exhause with 2 cats. Or a single y pipe set up. The guy i bought the truck from just has separate pipes from each manifold going to two cheap mufflers.

02-13-2007, 09:08 AM	#2
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	Re: did 86 trucks come with true duals or a y pip set up stock they came with 2 cats and a Y pipe setup with the pipe exiting on the side behind the passanger rear tire. i believe thats how it is.

02-13-2007, 09:26 AM	#3
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,553	Re: did 86 trucks come with true duals or a y pip set up 1/2 or 3/4 with light duty emissions, v8 gas engine - Single exhaust with two pipes from muffler back both exiting driver's side (not passenger). 3/4 or 1 ton with heavy duty emissions (no cats) duals with exits on both sides. Diesels - duals exiting each side. __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

02-13-2007, 03:46 PM	#4
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: did 86 trucks come with true duals or a y pip set up Gracho is right on ,Y-pipe to single exhaust, my 83 came that way and I would run the true dual exhaust like you described, had a friend of mine pull the exhaust pipe at the manifolds and run duals with 40 series Flows, when it came time to smog I would throw the original exhaust back up, the older I got the more of a hassle it became so now i'm running a single 3" exhaust with a 3" cat and 3'' in and dual 2.5 out Flowmaster dumped in front of the axel John

02-13-2007, 07:18 PM	#6
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: did 86 trucks come with true duals or a y pip set up My truck 84 GMC Sierra Classic and the son's 86 Silverado came with a "Y" pipe and a single catalytic convertor under the passenger side. This went to a single muffler and then out the passenger side at the rear fender. That did not last long in my world. There are headers, a connection underneath to a "H" pipe and then to dual Flowmaster mufflers and out the back through "MEGS" stainless tips. We don't have smoggies here. The upgrade would be to use a "X" crossover pipe, rather than the "H" design, but I will wait for old age to take out the pipe first.

02-13-2007, 08:40 PM	#7
shrtbx Registered User Join Date: Feb 2007 Location: los angeles Posts: 202	Re: did 86 trucks come with true duals or a y pip set up whats a good set up smog legal headers for california.

02-13-2007, 08:45 PM	#8
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Re: did 86 trucks come with true duals or a y pip set up I don't think any of our trucks that came with a cat had the cat on the passenger side. I know my 85 came with a y-pipe and the cat was on the drivers side. __________________ Mike 1985 Chevy C-10

02-14-2007, 08:15 AM	#10
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Re: did 86 trucks come with true duals or a y pip set up I bought an '85 new and it was set up as a Y pipe into a single cat and then into a muff and dual out and exit the driver side. I also bought my '87 new and it was exactlly the same set up as the '85. So i don't think Chevy would of changed the entire exhaust system for one year and put it on the other side or as dual set up. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

02-14-2007, 12:10 PM	#11
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: did 86 trucks come with true duals or a y pip set up My son's truck and mine both were on the passenger side. I know this very well, since I had to remove all of the damnable metal shielding along with the cat in my changes to the trucks.

02-14-2007, 09:35 PM	#12
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: did 86 trucks come with true duals or a y pip set up True duals is the only way to roll. Got no smog testing up here so nothing to worry about. __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

02-16-2007, 07:51 PM	#15
Curly86 You want it there when??? Join Date: Oct 2006 Location: Lewisburg Ky Posts: 393	Re: did 86 trucks come with true duals or a y pip set up My 86 Silverado has got a Y pipe no cat goes into muff and comes out dual and one pipe goes out each side

02-16-2007, 08:25 PM	#16
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: did 86 trucks come with true duals or a y pip set up Everyone I have seen that was stock. Has the manifolds, y pipe, then catalytic convertor on the driverside, intermediate pipe, over the axle pipe and then muffler with dual tail pipes on the driverside. I did seen a hd 3/4 ton. It has stainless steel manifold but more like shorty headers, dual pipes down each side, not catalytic convertors, two mufflers, tail pipes 90ed behind the tires. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

02-16-2007, 09:41 PM	#17
84 400 Sb 400 club Join Date: Nov 2005 Location: NH / MA Posts: 2,746	Re: did 86 trucks come with true duals or a y pip set up On my 85 it was Y pipe, then ran dowm the drivers side into a cat and then a muffler and then exit in two pipes coming out be hind the drivers side rear tire. That was stock. on my 84 the y pipe and pipe ran down the passangerside into a cat then a muffler. __________________ 1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out



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