Two sets of mufflers?? Will it work? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

northerngmc · 04-17-2007, 06:24 PM

My 69 GMC 1/2 ton I am attempting to get on the raod is quite loud and I would like to make it quieter for driving around town.

The truck has a 350 with header and dual exhaust. Both collector gaskets were leaking and fixing them has made it quieter, but still loud.

The exhaust systems seems to be in good shape, no holes and covered in surface rust.

It has mufflers, but what I would call blue bottles or cherry bombs. The mufflers are 17 inches long and about 3.5 or 4 inches in diameter. I think they were meant to flow and make noise.

The mufflers are located over the rear axle.

What I am wondering about is cutting the pipes in front of the current mufflers and installing a second set of mufflers. Therefore running two mufflers on each side.

Will this harm anything?

Any suggestions?

*Shane* · 04-17-2007, 07:15 PM

why not just buy better mufflers and replace the ones you have

krue · 04-17-2007, 07:27 PM

Sounds like a good idea to me. Less work too.

RACINJASON22 · 04-17-2007, 07:29 PM

Shane said what I was thinking but to answer your question NO it won't hurt anything. Specially when the set on there are basiclly, just probably pipes with baffles on the outside normall glasspack design that provide very little to No back pressuer in the first place.

2nd_wnd · 04-17-2007, 07:30 PM

I switched mine from glaspack that dumped at axle to magnaflows and full pipe it made a beg difference seems to run a little better now too

cdowns · 04-17-2007, 07:31 PM

old caddys and lincolns used to run dual mufflers on each pipe// but i do agree with the rest theres no reason a good turbo type muffler should keep a mild 350 quiet enough

tiggerstoy · 04-17-2007, 07:36 PM

a good set of mufflers will do the trick

northerngmc · 04-17-2007, 09:22 PM

Quote:

Originally Posted by 2nd_wnd

I switched mine from glaspack that dumped at axle to magnaflows and full pipe it made a beg difference seems to run a little better now too

What type/models of magnaflows did you use?

northerngmc · 04-17-2007, 09:25 PM

One of the reasons I am looking to not replace mufflers is the location and size of the current ones. They seem short at 17 inches long and because the pipes bend up and over the rearend I don't think going to longer ones will be easy.

I guess if I could find replacements that would fit in where the old ones are I would do that, but I have looked online at Summit Racing and haven't found any that seem even close in size.

Under the middle of the truck there is a long stretch of straight pipe and I thought it would be easy to buy a set of generic mufflers and cut the pipe and install!

04-17-2007, 06:24 PM	#1
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Two sets of mufflers?? Will it work? My 69 GMC 1/2 ton I am attempting to get on the raod is quite loud and I would like to make it quieter for driving around town. The truck has a 350 with header and dual exhaust. Both collector gaskets were leaking and fixing them has made it quieter, but still loud. The exhaust systems seems to be in good shape, no holes and covered in surface rust. It has mufflers, but what I would call blue bottles or cherry bombs. The mufflers are 17 inches long and about 3.5 or 4 inches in diameter. I think they were meant to flow and make noise. The mufflers are located over the rear axle. What I am wondering about is cutting the pipes in front of the current mufflers and installing a second set of mufflers. Therefore running two mufflers on each side. Will this harm anything? Any suggestions? __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

04-17-2007, 07:15 PM	#2
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: Two sets of mufflers?? Will it work? why not just buy better mufflers and replace the ones you have

04-17-2007, 07:27 PM	#3
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Two sets of mufflers?? Will it work? Sounds like a good idea to me. Less work too. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

04-17-2007, 07:29 PM	#4
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Two sets of mufflers?? Will it work? Shane said what I was thinking but to answer your question NO it won't hurt anything. Specially when the set on there are basiclly, just probably pipes with baffles on the outside normall glasspack design that provide very little to No back pressuer in the first place. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-17-2007, 07:30 PM	#5
2nd_wnd Registered User Join Date: Feb 2007 Location: Winston Salem, NC Posts: 310	Re: Two sets of mufflers?? Will it work? I switched mine from glaspack that dumped at axle to magnaflows and full pipe it made a beg difference seems to run a little better now too __________________ 72 LWB

04-17-2007, 07:31 PM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Two sets of mufflers?? Will it work? old caddys and lincolns used to run dual mufflers on each pipe// but i do agree with the rest theres no reason a good turbo type muffler should keep a mild 350 quiet enough __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 04-17-2007 at 08:01 PM.

04-17-2007, 07:36 PM	#7
tiggerstoy tiggerstoy Join Date: Mar 2007 Location: camrose Alberta Canada Posts: 416	Re: Two sets of mufflers?? Will it work? a good set of mufflers will do the trick

04-17-2007, 09:25 PM	#9
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: Two sets of mufflers?? Will it work? One of the reasons I am looking to not replace mufflers is the location and size of the current ones. They seem short at 17 inches long and because the pipes bend up and over the rearend I don't think going to longer ones will be easy. I guess if I could find replacements that would fit in where the old ones are I would do that, but I have looked online at Summit Racing and haven't found any that seem even close in size. Under the middle of the truck there is a long stretch of straight pipe and I thought it would be easy to buy a set of generic mufflers and cut the pipe and install! __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!



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