exhaust questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jmac05 · 07-25-2002, 01:15 PM

Ok,
I Need to get new ehaust pipes, and a muffler. They are so rusted, they have holes. So, here's what I want, I want as little sound, rumbling as possible. I want to have the engine running, and not beable to tell. That may not be possible, but it's an idea of what I want. I also want performance, as well as dual pipes out the back.
I guess what I'd like to know is what size pipes to use, # of chamber (and brand) of muffler to get, and what ever else.
Gracias...

**MikeB** · 07-25-2002, 02:13 PM

Have a muffler shop use 2 1/4 inch aluminized pipe (nevers rusts) and some mufflers with at least a 20" long body with offset-inlet/offset-outlet (as opposed to offset-inlet/center-outlet, etc.). Midas makes some seriously quiet gold mufflers. I used a pair of them (meant for a Cadillac, I think) on a 57 Chevy with a hot solid-lifter 292 (.060" over 283). It was so quiet, all you could hear was the lifter tick at idle, and a pleasant subdued rumble on acceleration. Walker also has a new Quiet Flow model that's supposed to have lower restriction without the noise. If yours is a stock, low rpm engine, a single 2.5" pipe and muffler would probably do the trick. Whatever you do, use mufflers with the biggest case you can fit under the truck. Something for an old 500-inch Cadillac or 430 Lincoln might be a good place to start.

Southpa · 07-25-2002, 03:06 PM

I also heard that crossover pipes quiet things down considerably. Thats the way I will be going when my exhaust starts to rot off.

slam33 · 07-25-2002, 06:04 PM

Long mufflers from walker, a crossover (h-pipe) and set the mufflers as far back as you can. I have mine under the bed above the rear axel. Get some good rubber muffler hangers too. your quietes system will be 2 inch or 2 1/4 off cast manifolds.

Mike C · 07-26-2002, 04:56 PM

Use the Walker Hemi Turbos. They are about $35 each from Summit. If you have 2" Rams horns, get the 2 1/4" mufflers. If you have the 'vette 'horns, go for the 2 1/2" If you've got headers go for the 2 1/2" as well.

**MikeB** · 07-28-2002, 09:06 PM

Mike C. --- I took your advice earlier this year and got the 20" DynoMax Super Hemi Turbos. Even with an equalizer pipe, they're not as quiet as I'd like -- too much "rat-tat-tat" on acceleration. I'm thinking of using small glass packs or maybe a couple DynoMax Bullet race mufflers for resonators. My exhaust guy says to buy the offset-in, offset-out mufflers next time. Don't know if DynoMax makes any like that.

crazy longhorn · 07-28-2002, 10:49 PM

Dynomax has muffs in a double offset, here is a link http://store.summitracing.com/partdetail.asp?part=8301

07-25-2002, 01:15 PM	#1
Jmac05 L.E.D. Tail lights, Baby! Join Date: Jan 2002 Location: Corona, Ca Posts: 290	exhaust questions Ok, I Need to get new ehaust pipes, and a muffler. They are so rusted, they have holes. So, here's what I want, I want as little sound, rumbling as possible. I want to have the engine running, and not beable to tell. That may not be possible, but it's an idea of what I want. I also want performance, as well as dual pipes out the back. I guess what I'd like to know is what size pipes to use, # of chamber (and brand) of muffler to get, and what ever else. Gracias... __________________ *Prov 3:5-8* "Hook 'em" L.E.D. Taillights for sale NOW!!! If interested, visit: www.earlyclassic.com or our website: www.jmcled.com All 67-72 GM Taillights are on sale untill 5 p.m. on Dec 15th, with Guaranteed Christmas delivery! joel.mcwaters@jmcled.com

07-25-2002, 02:13 PM	#2
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,432	Have a muffler shop use 2 1/4 inch aluminized pipe (nevers rusts) and some mufflers with at least a 20" long body with offset-inlet/offset-outlet (as opposed to offset-inlet/center-outlet, etc.). Midas makes some seriously quiet gold mufflers. I used a pair of them (meant for a Cadillac, I think) on a 57 Chevy with a hot solid-lifter 292 (.060" over 283). It was so quiet, all you could hear was the lifter tick at idle, and a pleasant subdued rumble on acceleration. Walker also has a new Quiet Flow model that's supposed to have lower restriction without the noise. If yours is a stock, low rpm engine, a single 2.5" pipe and muffler would probably do the trick. Whatever you do, use mufflers with the biggest case you can fit under the truck. Something for an old 500-inch Cadillac or 430 Lincoln might be a good place to start. __________________ Mike 1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

07-25-2002, 03:06 PM	#3
Southpa Registered User Join Date: May 2000 Location: Victoria, BC, Canada Posts: 2,410	I also heard that crossover pipes quiet things down considerably. Thats the way I will be going when my exhaust starts to rot off. __________________ 1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first.

07-25-2002, 06:04 PM	#4
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	Long mufflers from walker, a crossover (h-pipe) and set the mufflers as far back as you can. I have mine under the bed above the rear axel. Get some good rubber muffler hangers too. your quietes system will be 2 inch or 2 1/4 off cast manifolds. __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

07-26-2002, 04:56 PM	#5
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,714	Use the Walker Hemi Turbos. They are about $35 each from Summit. If you have 2" Rams horns, get the 2 1/4" mufflers. If you have the 'vette 'horns, go for the 2 1/2" If you've got headers go for the 2 1/2" as well. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

07-28-2002, 09:06 PM	#6
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,432	Mike C. --- I took your advice earlier this year and got the 20" DynoMax Super Hemi Turbos. Even with an equalizer pipe, they're not as quiet as I'd like -- too much "rat-tat-tat" on acceleration. I'm thinking of using small glass packs or maybe a couple DynoMax Bullet race mufflers for resonators. My exhaust guy says to buy the offset-in, offset-out mufflers next time. Don't know if DynoMax makes any like that. __________________ Mike 1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 07-29-2002 at 10:49 AM.

07-28-2002, 10:49 PM	#7
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Dynomax has muffs in a double offset, here is a link http://store.summitracing.com/partdetail.asp?part=8301



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