cheap muff - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67cst · 09-15-2003, 02:38 AM

lers.....hey guys what shouldi get for the 71, the muffler is shot and i wanan do this low buck and i want it to sound sorta loud and raspy...obviously a brand name muffler is out of the question, would a glass pack and turn down do the trick?

hgs_notes · 09-15-2003, 04:01 AM

Go with the sonic turbo. Cheap and sounds better than a glass pack.

72MARIO · 09-15-2003, 12:02 PM

Flo Pro. I put 2 of them on My girlfriends 95 Grand Prix Sound Awesome. I have heard them on a Truck before sounded really good.

Should cost about 70 Bucks. CDn.

lukecp · 09-15-2003, 01:26 PM

Glasspacks do sound loud and raspy....dirt cheap too.

But they make noise, not power....

67cst · 09-15-2003, 02:24 PM

where do you get those sonic turbos from?

hgs_notes · 09-15-2003, 03:30 PM

Found this while cruising the net: As you can see, the sonic turbos are quieter than the flowmasters and have less back pressure. They really outperform the thrush. I was surprised by the numbers compared to flowmaster and dynomax, since they kind of advertise superior power. Anyway, I think you should be able to find these at most part stores.

HG

From High Performance Pontiac, Aug 92, "Silent Power" by Tom Hand

back pressure chart, inches of water - 27.7 inches H2O = 1 PSI
2.5" exhaust system & mufflers. Sound readings static 2200 RPM
pressure readings wide open at 5200 RPM.

dBA in H2O muffler
95 0 open
90 58 SuperTrapp 18
81 86 Dynomax 17749
84 90 Borla
84 90 Cyclone Sonic Turbo
85 97 Thrush CVX
83 104 Dynomax 17734
90 118 Flowmaster 42550D
83 125 AP XLERATOR
89 125 Supertrapp 12
90 159 Flowmaster 42551H
78 312 stock replacement muffler, 2.5 inlet, 2.0 outlet,
. oval, offset inlet, lifetime warranty - 11.25 PSI back
. pressure

from _How to Build Horsepower_ by David Vizard

Flow numbers are at 25 inches of H20

CFM inlet muffler
385 2.5" Cyclone Sonic Turbo
375 2.5" Walker Dynomax
360 2.5" Thrush Turbo 500

And for comparison purposes
293 2.5" "genuine" GM turbo corvair unit
279 2.5" Midas Turbo
207 2.25" Thursh Turbo 501

67cst · 09-15-2003, 09:19 PM

hey guys the dude at lordco sold me a thrush turbo muffler for 33 bucks, half price! so i couldnt turn it down..sounds better than the old one id say. not worth posting pics really, but im happy with how it turned out...

Derek

*Phillip Johnson* · 09-15-2003, 09:43 PM

Now all you need is the asprin

krazy_texan · 09-16-2003, 12:37 AM

i have glass packs i like them they are loud and raspy but they give no power thats why i make up for it with 3" pipe

09-15-2003, 02:38 AM	#1
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	cheap muff lers.....hey guys what shouldi get for the 71, the muffler is shot and i wanan do this low buck and i want it to sound sorta loud and raspy...obviously a brand name muffler is out of the question, would a glass pack and turn down do the trick? __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

09-15-2003, 04:01 AM	#2
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Go with the sonic turbo. Cheap and sounds better than a glass pack. __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-15-2003, 12:02 PM	#3
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Flo Pro. I put 2 of them on My girlfriends 95 Grand Prix Sound Awesome. I have heard them on a Truck before sounded really good. Should cost about 70 Bucks. CDn. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

09-15-2003, 01:26 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Glasspacks do sound loud and raspy....dirt cheap too. But they make noise, not power.... __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

09-15-2003, 02:24 PM	#5
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	where do you get those sonic turbos from? __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

09-15-2003, 03:30 PM	#6
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Found this while cruising the net: As you can see, the sonic turbos are quieter than the flowmasters and have less back pressure. They really outperform the thrush. I was surprised by the numbers compared to flowmaster and dynomax, since they kind of advertise superior power. Anyway, I think you should be able to find these at most part stores. HG From High Performance Pontiac, Aug 92, "Silent Power" by Tom Hand back pressure chart, inches of water - 27.7 inches H2O = 1 PSI 2.5" exhaust system & mufflers. Sound readings static 2200 RPM pressure readings wide open at 5200 RPM. dBA in H2O muffler 95 0 open 90 58 SuperTrapp 18 81 86 Dynomax 17749 84 90 Borla 84 90 Cyclone Sonic Turbo 85 97 Thrush CVX 83 104 Dynomax 17734 90 118 Flowmaster 42550D 83 125 AP XLERATOR 89 125 Supertrapp 12 90 159 Flowmaster 42551H 78 312 stock replacement muffler, 2.5 inlet, 2.0 outlet, . oval, offset inlet, lifetime warranty - 11.25 PSI back . pressure from _How to Build Horsepower_ by David Vizard Flow numbers are at 25 inches of H20 CFM inlet muffler 385 2.5" Cyclone Sonic Turbo 375 2.5" Walker Dynomax 360 2.5" Thrush Turbo 500 And for comparison purposes 293 2.5" "genuine" GM turbo corvair unit 279 2.5" Midas Turbo 207 2.25" Thursh Turbo 501 __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-15-2003, 09:19 PM	#7
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	hey guys the dude at lordco sold me a thrush turbo muffler for 33 bucks, half price! so i couldnt turn it down..sounds better than the old one id say. not worth posting pics really, but im happy with how it turned out... Derek __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

09-15-2003, 09:43 PM	#8
Phillip Johnson Account Suspended Join Date: Apr 2000 Location: Grants Pass, Oregon Posts: 1,579	Now all you need is the asprin

09-16-2003, 12:37 AM	#9
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	i have glass packs i like them they are loud and raspy but they give no power thats why i make up for it with 3" pipe __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO



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