thoughts on my exhaust design on my 87 GMC crew cab long bed dually - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevy Padilla · 02-27-2015, 09:47 PM

Thoughts on exhaust design do my 87 GMC crew cab long bed dually with 454
Its start from manifold dual exhaust to 3" pipe to cats from cats to x pipe from to two flowmaster super 44 from mufflers to 3" inch intrets to 4" exit tips the exhaust is go stop in front of the back tires

y5mgisi · 02-27-2015, 11:52 PM

Sounds a bit over kill and overly loud, but not too bad. I think dual 2.5" would probably be better. And i bet you would be happier with 50 series.

cmax87v3500 · 03-01-2015, 02:38 AM

Unless its a Built motor that probably going to be too much exhaust. A single 3" is usually plenty on stock or even slightly built motors in my opinion. Single 3" on my 454 trucks.

SCOTI · 03-01-2015, 05:14 AM

3" into the muff's is do-able. Downsize from there (especially if its TBI).

02-27-2015, 09:47 PM	#1
Chevy Padilla Registered User Join Date: Feb 2015 Location: Phoenix Posts: 13	thoughts on my exhaust design on my 87 GMC crew cab long bed dually Thoughts on exhaust design do my 87 GMC crew cab long bed dually with 454 Its start from manifold dual exhaust to 3" pipe to cats from cats to x pipe from to two flowmaster super 44 from mufflers to 3" inch intrets to 4" exit tips the exhaust is go stop in front of the back tires

02-27-2015, 11:52 PM	#2
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: thoughts on my exhaust design on my 87 GMC crew cab long bed dually Sounds a bit over kill and overly loud, but not too bad. I think dual 2.5" would probably be better. And i bet you would be happier with 50 series. __________________ 90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt. 77 C20 crew cab Silverado. 396/th400. In work.

03-01-2015, 02:38 AM	#3
cmax87v3500 Registered User Join Date: Apr 2012 Location: Wenatchee Washington Posts: 102	Re: thoughts on my exhaust design on my 87 GMC crew cab long bed dually Unless its a Built motor that probably going to be too much exhaust. A single 3" is usually plenty on stock or even slightly built motors in my opinion. Single 3" on my 454 trucks. __________________ 1987 GMC V3500 Sierra Classic

03-01-2015, 05:14 AM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,132	Re: thoughts on my exhaust design on my 87 GMC crew cab long bed dually 3" into the muff's is do-able. Downsize from there (especially if its TBI). __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

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