73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Exhaust => Topic started by: LTZ C20 on December 20, 2015, 03:22:38 am
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Hey all, wasn't sure if this sub-forum or performance would have been better for this post.
Here's the deal, I'm just exploring the possibility of making the truck quieter than it currently is. I love the mufflers I have, (Flowmaster Super 44 Delta Flow), but there are curtain situations that I'm getting irritated by the loud exhaust.
-Drive thru's, I have to speak loud and hope they can here me, most times I just shut the truck off.
-Having a conversation next to the truck when it's running, that is frustrating at times, leads to shutting off.
-I'm pretty sure every home in my girlfriend's court is getting tired of me leaving late at night and firing up what probably sounds to them like a monster truck.
-I feel bad when I come home late and my exhaust wakes up the people sleeping in my house or the neighbors on the other side of the pasture. Same goes for when leaving while people are sleeping.
I know it sounds like all the normal times you hear exhaust, but here's the punch line, sitting in traffic most times is never an issue. During normal acceleration it sounds pleasant and healthy. Under hard accel, it makes all kinds of joyous noise that makes you get butterflies inside like a little kid on christmas morning and sings praises to the performance gods in hot rod heaven. Those things I like about the exhaust.
So I want to make it quiet. Like one of these would have orginally sounded like (never heard that actually) or like the newer 2003 & up 6.0s and 6.2s sounds in the trucks. Noticeable when you step on it but acceptable all other times.
Now my questions, does Flowmaster make a stock replacement muffler that has just some pretty noise under hard accel conditions. Do you guys know any mufflers that might sound good. I also looked into cutouts to be able to choose between quiet and noise maker systems, installed just before the mufflers so I can pick either or. Or do I just replace both mufflers with quiet ones and not worry about how it sounds under heavy throttle?
In reality, it's a 3/4 ton truck, not a suped up camaro. It's used to daily drive and and tow/haul stuff. Really it was cool in high school, but now I'm kinda over it except when I'm getting into it. I'm not even 25 yrs old and at times I'm like "shut up, that's enough of that noise" and I shut it off. I must be aging faster than normal, I drink alot of coffee too lol.
Anyway, idea welcome as always. Maybe 2 stock mufflers from a curtain year will give me the sound I'm looking for? Thanks in advance.
P.s. I still like my country music loud.
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on some cars nowadays and for a while they have a resonator before the muffler, much like a glasspack. it might be what youre looking for
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I know what you speak of, lots of vehicles also have valves which under normal driving make it sound normal, under aggressive driving the valve opens and let's exhaust flow thru another chamber in the muffler for a more aggressive sound. Camaro's and vette's have this.
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To quiet the exhaust noise in the cab, you'll want to put the mufflers quite far back from the engine. I think it's pretty common to have the mufflers exit near the rear axle. From there, you want a tail pipe that takes the spent exhaust gases past the vehicle's body, so that you don't get any reverberation (like if you have the tips pointed at the ground right out of the mufflers) or reflecting (like if the exhaust exited just a bit before the rear bumper, so that the exhaust gas is reflected by the 'U' shape of the bumper) of the noise back into the cab.
Make sure the exhaust hangers are actual rubber exhaust hangers, and not something like plumber's tape welded to the pipe and the frame. That would transfer vibration to the body, and you don't want to find out how many things on your pickup buzz, hum and rattle when start vibrating.
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Are you running headers?
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I run headers, dual exhaust and flowmasters and it's quiet enough at idle to hear just fine. Which way does your exhaust exit, no leaks?
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There is an 85 Monte Carlo SS in my neighborhood with an LS6/6 speed with electric exhaust cut outs. There is big orange sticker on the rear window that reads "if its too loud, your to old". Well, I guess I'm getting old.
I've had my 69 camaro for over 15 years. Back then the car had a 1970 LT1 GM replacement motor (back before they were called crate motors). The motor had a roudy Crane solid cam. With headers and Flowmasters, it made some noise.
I realized I was getting old when one day I pulled into a custom muffler shop and asked them what they could do to quite it down a little (it was a welded system and I didn't have a welder back then).
The shop put the car on the lift and removed the Flowmasters and installed some Dynomax turbo mufflers.
I don't have any decibel level readings of before and after, but it did drop down the noise level.
Getting old ain't easy.
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Are you running headers?
Sí señor.
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To quiet the exhaust noise in the cab, you'll want to put the mufflers quite far back from the engine. I think it's pretty common to have the mufflers exit near the rear axle. From there, you want a tail pipe that takes the spent exhaust gases past the vehicle's body, so that you don't get any reverberation (like if you have the tips pointed at the ground right out of the mufflers) or reflecting (like if the exhaust exited just a bit before the rear bumper, so that the exhaust gas is reflected by the 'U' shape of the bumper) of the noise back into the cab.
Make sure the exhaust hangers are actual rubber exhaust hangers, and not something like plumber's tape welded to the pipe and the frame. That would transfer vibration to the body, and you don't want to find out how many things on your pickup buzz, hum and rattle when start vibrating.
The hangars are indeed rubber hangars.
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I run headers, dual exhaust and flowmasters and it's quiet enough at idle to hear just fine. Which way does your exhaust exit, no leaks?
Nope, no leaks. The exhaust exits behind the rear diff *cough cough* right behind the rear diff...... in 2 pipes, pointed straight at the ground, tips cut parallel to the street, under the rear half of the bed......
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There is an 85 Monte Carlo SS in my neighborhood with an LS6/6 speed with electric exhaust cut outs. There is big orange sticker on the rear window that reads "if its too loud, your to old". Well, I guess I'm getting old.
I've had my 69 camaro for over 15 years. Back then the car had a 1970 LT1 GM replacement motor (back before they were called crate motors). The motor had a roudy Crane solid cam. With headers and Flowmasters, it made some noise.
I realized I was getting old when one day I pulled into a custom muffler shop and asked them what they could do to quite it down a little (it was a welded system and I didn't have a welder back then).
The shop put the car on the lift and removed the Flowmasters and installed some Dynomax turbo mufflers.
I don't have any decibel level readings of before and after, but it did drop down the noise level.
Getting old ain't easy.
I'm not even 25 yet.
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I always thought if you were under 25 you could getv away with running open headers.
Times are changing.
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Nope, no leaks. The exhaust exits behind the rear diff *cough cough* right behind the rear diff...... in 2 pipes, pointed straight at the ground, tips cut parallel to the street, under the rear half of the bed......
You're probably getting alot of sounds bouncing back up off the road, I have mine exit straight out the back under the bumper, and its loud but not where I have to yell over it. It'd be pretty easy to cut off the turn downs and slide some new pipe on, see if that helps and only cost a few bucks in pipe and clamps
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tips cut parallel to the street, under the rear half of the bed......
Here's your problem
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This truck has a big block with 3" exhaust and it is loud but not inside the cab
(http://i6.photobucket.com/albums/y228/Sabaka454/IMAG0404_zps49463413.jpg)
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tips cut parallel to the street, under the rear half of the bed......
Here's your problem
I knew that was comming. Lol.
Back when I had the old engine and single pipe exhaust, the passenger side came across and met the drivers, they went into a 3 inch pipe, that pipe went to the inlet of the muffler, the muffler had dual 2.5 inch outs, both out pipes went over the rear axle, and turned 90°, exiting straight behind both rear tires. I didn't like the look so I cut the pipe off just over the rear axle. So when I had this new exhaust system put in, that's why I had it done the way it is. I just think that exhaust pips don't look good on my truck, when I cut the old pipes back a bit, the sound was the same but the look was much cleaner. Standing, looking at the truck, you can't really see any of the exhaust system. I just think it looks alot cleaner with no visible pipes.
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I have a brand new factory dual exh. system, like 2.5" pipes and i think it sounds like an old beater with a rotted out muffler, way too loud for me, but i'm way to old too. Would like to get it to sound like it did back in 77. BTW, nice camaro.
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Some of the guys at work said Borla exhaust is good for being calm under normal driving and sounds mean under heavy pedal. Borla is tho, pretty expensive.
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Thats not a bad trade-off LT, will check it out.
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But Borla ain't cheap.
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Super trapp makes a tunable muffler that you can add or remove "sound discs" to make it loud or mellow.
The drawback is they they are not cheap.
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With that ability, I bet they aren't.
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Supertrapps balance "too much noise" with "not enough flow."
They are really meant as a spark arrestor for dirt bikes so as not to set fire to the toolies.
Borlas have always sounded nice to my ears, no matter what they are on. Pricey though.
I'm running Dynomax Super Turbos on my C10. Decent "noticeable" idle, no drone on the highway (you can hold a conversation easily), and "reasonably" throaty on full throttle. I'd like it louder, but truthfully, I'm not 16 any more.
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Yea I have no drone on the freeway, that's not the issue. It's when I'm sitting still. But I think I might just take it back to the exhaust shop and have him make up 2 removable sections. Since mine currently stop over the rear axle, I'll see if he could make a short section that will slip over the end of the current pipe, held tight with some kind of slip on or band clamp and extend the system back to the full rear of the truck, exiting straight out the back under the bumper in 2 3 inch tips on either side of my hitch receiver.
I'm thinking straight out the back in plan aluminized steel because I don't like tips showing on this truck so if I get plain steel then it will be less noticeable than chrome or stainless steel stips. And with the sections added not being welded on, I can remove them if I want for looks or the sound or whatever.
It's either that or exiting at the half way point on the rear fenders between the corners of the bed and wheel wells. I don't like the look of pointing straight out the side perpendicular to the body behind the wheels, I also don't like the look of the tips pointing straight out at the very corners under the tailights and corners of the bumper. So straight back seams the next best place.
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haha i know how you feel - i put flowmaster 40's on mine 2 years ago - i was 41 - now im 43 and the noise inside the cab is getting old -lol - i think i'll try the 50 series out next now that i know the delta 44's aren't much better even though they say they are .
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Idk what I'm gonna do yet. I've considered just putting the stock muffler off of a newer truck with a 6.0.
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Walker makes some Nice stock typle mufflers that flow great and sound mellow, Flowmaster are about the worst mufflers there are just after stock OEM . they dont flow.
This was posted on www.fullsizechevy.com which is a truck forum. Supposedly this review was performed by Martel Brothers...
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All tests via an independent lab
All tests @ 15” wc
2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM
2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM
2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM
2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM
Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
Standard OEM 2 ½” Inlet/Outlet 161-197 CFM
The madrel bending of the pipes done by aftermarket exhaust companies is good for 2-4 h.p. depending on the severity of the stock bends. Most local exhaust places dont have a mandrel bender so changing the pipes out doesnt do anything if pipe size it not increased.
My opinion, if its more noise and a little more power just add the best flowing stainless muffler to the current system and never do it again. If you increase pipe sizes, then a local shop and only stainless. Dont care about money but want ease and better gains than most local shops can offer with no pipe size increase, and aftermarket exhaust.
NOISE does not mean power, some think it does is why Flowmasters are sold in the numbers they are!!!
https://www.youtube.com/watch?v=mhORA4sqZP4
http://www.svtoa.org/articles_006.htm
MODEL
Flow Rate Muffler Inlet Size
@ 20.3" H2O
+ Edelbrock 5501 492 scfm 2.25"
$ Flowmaster 42440 483 scfm 2.25"
Race Magnum Welded 17216 711 scfm 2.25"
+ Edelbrock 5511 579 scfm 2.50"
$ Flowmaster 42540 352 scfm 2.50"
Ultra-Flo SS 17263 1133 scfm 2.50"
Race Magnum Welded 17218 1000 scfm 2.50"
# Borla 40600 836 scfm 2.50"
+ Edelbrock 5505 708 scfm 3.00"
$ Flowmaster 43040 392 scfm 3.00"
Ultra-Flo SS 17296 2200 scfm 3.00"
Race Magnum Welded 17220 2200 scfm 3.00"
# Borla 40450 1400 scfm 3.00"
# Borla 40575 1100 scfm 3.00"
@ Edelbrock 5535 562 scfm 3.50"
$ Flowmaster 435409 576 scfm 3.50"
Ultra-Flo SS 17268 2200 scfm 3.50"
Race Magnum Welded 17224 2200 scfm 3.50"
# Borla 40615 854 scfm 3.50"
@ Edelbrock 5537 1400 scfm 4.00"
* Flowmaster 54040-10 634 scfm 4.00"
Race Magnum Welded 17225 2600 scfm 4.00"
# Borla 40741 1450 scfm 4.00"
+ Edelbrock General Application Series
@ Edelbrock Victor Series Race
$ Flowmaster 40 Series ( 2 Chamber)
* Flowmaster Delta Force Race Series
# Borla XR-1 Racing Series (Round or Oval)
and you are going to have to exit the exhaust from under the truck, or at a min angle the outlets towards the side.
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Thanks for the info Jim! I only picked the Flowmaster because my truck had a 40 series on it when I bought it and I liked the way these super 44s sounded. I never gave any thought to flow capabilities. The entire system is 2 1/2 inch, mandrel bent aluminized steel. I will say that, I recently made some changes to my timing and idle speed. Those changes have actually made the truck noticeably quieter. So I may end up just extending the tips out the rear so they aren't under the bed and that's it. I may also have them add a removable cross over tube.
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We listened to a bunch of sound clips on utube. Obviously they are short clips of questionable quality and each system is bent different. It does give you some idea what tone to expect. We preferred Magnaflow over Dynomax over Flowmaser. We ordered a Magnaflow #12568 that has an X pipe in the muffler. We hope to have the new system on this month or in February.