Factory side exhaust duals - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chrispbrown36 · 08-14-2016, 03:53 PM

Many years ago I had an 86 GMC C10. I remember replacing the muffler and tailpipes with some from Autozone. The muffler was a single out dual out and both pipes exited on the drivers side just behind the rear tire. I am curious if this was a factory set-up or aftermarket?

**mongocanfly** · 08-14-2016, 06:45 PM

My rememberer don't work like it used to but I don't remember a factory exhaust exit in front of the wheels..

cadillac_al · 08-14-2016, 07:49 PM

That was factory, single exhaust with dual tailpipes exiting behind the passenger rear tire.

Gmc.guy · 08-14-2016, 08:00 PM

My dad had an 85 with the same setup. It had a single 2-1/2 before and dual 2-1/4 out the back on the same side

Chrispbrown36 · 08-14-2016, 08:22 PM

The passenger side seems like a better idea...kinda insulated the driver from the sound somewhat. I kinda like the look, so I might go that route when I redo my exhaust.

**mongocanfly** · 08-14-2016, 08:23 PM

My bad..I was speed reading and I thought he said in front of rear tires..ooopppsss..yall are right there were dual exhausts (behind) the rear tires..

tucsonjwt · 08-16-2016, 04:51 PM

I think my 83 C20 is mostly stock on the 454 exhaust, but the tailpipes exit behind the rear wheels on both sides. I think that is a more efficient exhaust idea, but I do not have a catalytic converter to deal with (3/4 tons trucks got cat exemption for a while in the early 80s. I think the factory configuration is tailpipes over the rear axle and dumping out the back in the 83 model.

Mr.Chevy4x4 · 08-16-2016, 06:15 PM

Yes, that was factory exhaust. Like this:

**Joesjunk** · 08-16-2016, 11:07 PM

Quote:

Originally Posted by tucsonjwt

I think my 83 C20 is mostly stock on the 454 exhaust, but the tailpipes exit behind the rear wheels on both sides. I think that is a more efficient exhaust idea, but I do not have a catalytic converter to deal with (3/4 tons trucks got cat exemption for a while in the early 80s. I think the factory configuration is tailpipes over the rear axle and dumping out the back in the 83 model.

It sound like your exhaust is correct, big blocks had factory duals and no cats ( until '87 ) and exit each side behind the tires

08-14-2016, 03:53 PM	#1
Chrispbrown36 Registered User Join Date: Apr 2014 Location: Cunningham, KY Posts: 351	Factory side exhaust duals Many years ago I had an 86 GMC C10. I remember replacing the muffler and tailpipes with some from Autozone. The muffler was a single out dual out and both pipes exited on the drivers side just behind the rear tire. I am curious if this was a factory set-up or aftermarket?

08-14-2016, 06:45 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,618	Re: Factory side exhaust duals My rememberer don't work like it used to but I don't remember a factory exhaust exit in front of the wheels..

08-14-2016, 07:49 PM	#3
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,353	Re: Factory side exhaust duals That was factory, single exhaust with dual tailpipes exiting behind the passenger rear tire. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

08-14-2016, 08:00 PM	#4
Gmc.guy Registered User Join Date: Nov 2015 Location: Alberta Posts: 464	Re: Factory side exhaust duals My dad had an 85 with the same setup. It had a single 2-1/2 before and dual 2-1/4 out the back on the same side __________________ -Cody

08-14-2016, 08:22 PM	#5
Chrispbrown36 Registered User Join Date: Apr 2014 Location: Cunningham, KY Posts: 351	Re: Factory side exhaust duals The passenger side seems like a better idea...kinda insulated the driver from the sound somewhat. I kinda like the look, so I might go that route when I redo my exhaust.

08-14-2016, 08:23 PM	#6
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,618	Re: Factory side exhaust duals My bad..I was speed reading and I thought he said in front of rear tires..ooopppsss..yall are right there were dual exhausts (behind) the rear tires..

08-16-2016, 04:51 PM	#7
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	Re: Factory side exhaust duals I think my 83 C20 is mostly stock on the 454 exhaust, but the tailpipes exit behind the rear wheels on both sides. I think that is a more efficient exhaust idea, but I do not have a catalytic converter to deal with (3/4 tons trucks got cat exemption for a while in the early 80s. I think the factory configuration is tailpipes over the rear axle and dumping out the back in the 83 model.

08-16-2016, 06:15 PM	#8
Mr.Chevy4x4 Registered User Join Date: Jul 2007 Location: Sims, NC Posts: 531	Re: Factory side exhaust duals Yes, that was factory exhaust. Like this: Attached Images __________________ All things Chevy truck: 1986 SWB "Jolene" boosted 5.3/4l80e project



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