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

72GMC2500 · 01-12-2008, 05:37 PM

Hey I'm thinking of getting dual exhaust with glasspack mufflers. Im just wondering if that'd boost my power very much if anybody has any idea please let me know.

67_C-30 · 01-12-2008, 06:10 PM

You'll feel a little power difference, mainly in throttle response, due to less restriction, but don't expect a total night and difference in power. The sound factor alone is worth the doing duals, but the few extra ponies are just a little bonus!

BigDaddyDave · 01-12-2008, 06:29 PM

I have had both single and dual exhaust,and i never noticed a huge increase in power,all of my trucks always sounded better with the duals. I think dual exhaust helps the motor breath a little easier.

chev74 · 01-12-2008, 08:11 PM

i, personally wouldnt go with glass packs though. There are so many mufflers out there that will give you a better tone than with glass packs. Im not telling you how to build your truck, just advising you to ask around, listen to other exhausts, and think it over. This could be the first impression that your truck gives out, since they will hear you coming!!!!!

tsetsaf · 01-12-2008, 09:10 PM

The dual exhaust will open up the motor a bit but remember that engines do require some back pressure. I would skip the glass packs and go with Flowmasters they have a great note on V-8s.

On my 71 the duals exit before the rear tires. People know when I hit the gas.

An option for keeping a single exit is to use a larger diameter tube. Keep in mind that you need to service your vehicle and extra pipes under the frame equals extra stuff to move and reach around.

Mark

**special-K** · 01-13-2008, 01:48 AM

There`s all kinds of room for duals under these trucks.It`s the first thing every truck I but gets.

My72BB · 01-13-2008, 02:07 AM

For what it is worth...I have worn out glass packs on mine with a big block. They are real poppy and rap out very noisy. I am going to magnaflows pretty quick just to get rid of the pop. When the glass packs are new they have a little more tone/depth in the sound but it does not take to long and the glass blows out. My son kind of describes my truck as sounding like a school bus.

Alan

72GMC2500 · 01-16-2008, 05:11 AM

ya thanks guys ill look at some other mufflers. i was thinking of folowmaster super 40's or something that should be pretty loud lol

01-12-2008, 05:37 PM	#1
72GMC2500 Registered User Join Date: Feb 2007 Location: Canada Posts: 53	Dual Exhaust Hey I'm thinking of getting dual exhaust with glasspack mufflers. Im just wondering if that'd boost my power very much if anybody has any idea please let me know. __________________ Stephen

01-12-2008, 06:10 PM	#2
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Dual Exhaust You'll feel a little power difference, mainly in throttle response, due to less restriction, but don't expect a total night and difference in power. The sound factor alone is worth the doing duals, but the few extra ponies are just a little bonus! __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

01-12-2008, 06:29 PM	#3
BigDaddyDave RIP BigDaddyDave ~7-23-09~ You will be missed~ Join Date: Aug 2007 Location: Concord NC Posts: 1,361	Re: Dual Exhaust I have had both single and dual exhaust,and i never noticed a huge increase in power,all of my trucks always sounded better with the duals. I think dual exhaust helps the motor breath a little easier. __________________ BigDaddyDave's Truck: http://www.flickr.com/photos/daves71chevy/ \| See it in Action!

01-12-2008, 08:11 PM	#4
chev74 Addicted to Chevy Join Date: Dec 2004 Location: Tyler, Tx Posts: 857	Re: Dual Exhaust i, personally wouldnt go with glass packs though. There are so many mufflers out there that will give you a better tone than with glass packs. Im not telling you how to build your truck, just advising you to ask around, listen to other exhausts, and think it over. This could be the first impression that your truck gives out, since they will hear you coming!!!!!

01-12-2008, 09:10 PM	#5
tsetsaf Registered User Join Date: Dec 2007 Location: Southern CA Posts: 210	Re: Dual Exhaust The dual exhaust will open up the motor a bit but remember that engines do require some back pressure. I would skip the glass packs and go with Flowmasters they have a great note on V-8s. On my 71 the duals exit before the rear tires. People know when I hit the gas. An option for keeping a single exit is to use a larger diameter tube. Keep in mind that you need to service your vehicle and extra pipes under the frame equals extra stuff to move and reach around. Mark

01-13-2008, 01:48 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Dual Exhaust There`s all kinds of room for duals under these trucks.It`s the first thing every truck I but gets. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-13-2008, 02:07 AM	#7
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Re: Dual Exhaust For what it is worth...I have worn out glass packs on mine with a big block. They are real poppy and rap out very noisy. I am going to magnaflows pretty quick just to get rid of the pop. When the glass packs are new they have a little more tone/depth in the sound but it does not take to long and the glass blows out. My son kind of describes my truck as sounding like a school bus. Alan

01-16-2008, 05:11 AM	#8
72GMC2500 Registered User Join Date: Feb 2007 Location: Canada Posts: 53	Re: Dual Exhaust ya thanks guys ill look at some other mufflers. i was thinking of folowmaster super 40's or something that should be pretty loud lol __________________ Stephen



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