Switch Back to Quiet Exhaust

[LTZ C20]

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.

[philo_beddoe]

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.

[LTZ C20]

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.

[philo_beddoe]

Thats not a bad trade-off LT, will check it out.

[LTZ C20]

But Borla ain't cheap.

[fitz]

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.

[LTZ C20]

With that ability, I bet they aren't.

[SkinnyG]

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.

[LTZ C20]

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.

[jg1977c20]

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 .

[LTZ C20]

Idk what I'm gonna do yet. I've considered just putting the stock muffler off of a newer truck with a 6.0.

[Jim_Hensley]

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...

*******************
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.

[LTZ C20]

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.

[Captain Swampy]

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.