single exaust? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigbadchev72 · 11-07-2007, 03:49 PM

Well I was wanting to go dual exaust on the blazer, but got to thinking what about a single 3" exaust? anyone done it? happy? or should i go dual 2 1/2 exaust like I had on my shortbox with 3" flowmasters

72Levi · 11-07-2007, 04:46 PM

Go with the 2 1/2 dual you will be happy and it will run better.

**jaros44sr** · 11-07-2007, 04:53 PM

2 1/2" ramhorns and the same size exhaust pipes is what I'm installing now, well once I get my floorboards and frame rails painted... J.

bigbadchev72 · 11-07-2007, 05:31 PM

it is stock ramhorns, and a stock motor with an rv cam, not a tireburner by no means, just want it to sound good, this id my dd and a cruiser, not looking for high performance, just a good sound, I have a pair of 3" flowmasters that I will be using.

streetstar · 11-07-2007, 05:45 PM

I ran single exhaust on my '88 Blazer (3" with a Flowmaster 50 series muffler) for some very good reasons. It also sounds good without the annoying Flowmaster dual exhaust death rattle a lot of them have

It has a stock motor. The single exhaust systems do not rattle loose nearly as frequently as the dual systems do, whether you use them on the street or off-road , plus the performance gains from using duals on a stock motor is smaller than most would like to think, and virtually non-existent when comparing it to a 3" system for a stock small block.

Why would the factories "cripple" their vehicles with a single exhaust system If it is really that bad? They wouldnt.

It is more reliable, and can have similar performance with a stock motor in everyday driving conditions.

Drawbacks -- when re-doing the exhaust on an older vehicle - the y-pipe is almost never salvageable, and they take more time and effort to re-make than just "runnin duals out the back" --- duals are more profitable.

The old y-pipe is also a seriously restricted area in a truck too

LUV2XCLR8 · 11-07-2007, 06:15 PM

You can actually gain torque w/ single exhaust, and it only restricts it if you have
insane HP. This chart that I post on here all the time will give you a data point. I
am not an expert, but I did spend 2.5 years working part time at a muffler shop

My old 87 Formula had 3" pipe from F to R, A 3" flowmaster muffler, and a 4x28 tip

Jtrux · 11-09-2007, 06:52 AM

I've got dual 2.25 in mine and i'm pretty satisfied with it. When I first got my truck going I ran it with open headers for a couple days and then put the exhaust on, it ran a ton better and was quicker too.

11-07-2007, 03:49 PM	#1
bigbadchev72 People know me Join Date: Jun 2007 Location: Hermiston, oregon Posts: 840	single exaust? Well I was wanting to go dual exaust on the blazer, but got to thinking what about a single 3" exaust? anyone done it? happy? or should i go dual 2 1/2 exaust like I had on my shortbox with 3" flowmasters __________________ 1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels

11-07-2007, 04:46 PM	#2
72Levi Active Member Join Date: Feb 2006 Location: sa tx Posts: 851	Re: single exaust? Go with the 2 1/2 dual you will be happy and it will run better. __________________ 1972 K5 Blazer ALL ORIGINAL paint & engine, A/C, Tilt, 4sp, AM/FM, Tow Hooks, Aux Battery Tray, Tach, Vacuum 2004 FORD FX4 SuperCrew 2005 CTS-V 12 sec family car 2008 Buick Enclave AWD, Nav, & DVD, Wife LOVES it!

11-07-2007, 04:53 PM	#3
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,704	Re: single exaust? 2 1/2" ramhorns and the same size exhaust pipes is what I'm installing now, well once I get my floorboards and frame rails painted... J. __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 11-07-2007 at 04:54 PM.

11-07-2007, 05:31 PM	#4
bigbadchev72 People know me Join Date: Jun 2007 Location: Hermiston, oregon Posts: 840	Re: single exaust? it is stock ramhorns, and a stock motor with an rv cam, not a tireburner by no means, just want it to sound good, this id my dd and a cruiser, not looking for high performance, just a good sound, I have a pair of 3" flowmasters that I will be using. __________________ 1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels

11-07-2007, 05:45 PM	#5
streetstar Registered User Join Date: May 2007 Location: Moore, Oklahoma Posts: 2,396	Re: single exaust? I ran single exhaust on my '88 Blazer (3" with a Flowmaster 50 series muffler) for some very good reasons. It also sounds good without the annoying Flowmaster dual exhaust death rattle a lot of them have It has a stock motor. The single exhaust systems do not rattle loose nearly as frequently as the dual systems do, whether you use them on the street or off-road , plus the performance gains from using duals on a stock motor is smaller than most would like to think, and virtually non-existent when comparing it to a 3" system for a stock small block. Why would the factories "cripple" their vehicles with a single exhaust system If it is really that bad? They wouldnt. It is more reliable, and can have similar performance with a stock motor in everyday driving conditions. Drawbacks -- when re-doing the exhaust on an older vehicle - the y-pipe is almost never salvageable, and they take more time and effort to re-make than just "runnin duals out the back" --- duals are more profitable. The old y-pipe is also a seriously restricted area in a truck too

11-07-2007, 06:15 PM	#6
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,484	Re: single exaust? You can actually gain torque w/ single exhaust, and it only restricts it if you have insane HP. This chart that I post on here all the time will give you a data point. I am not an expert, but I did spend 2.5 years working part time at a muffler shop My old 87 Formula had 3" pipe from F to R, A 3" flowmaster muffler, and a 4x28 tip Attached Images __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

11-09-2007, 06:52 AM	#7
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: single exaust? I've got dual 2.25 in mine and i'm pretty satisfied with it. When I first got my truck going I ran it with open headers for a couple days and then put the exhaust on, it ran a ton better and was quicker too. __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

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