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johnunit
01-28-2011, 06:59 AM
The Mufflers
MAKE MODEL Part No. COST
SUMMIT Turbo 630125 $14.75
THRUSH Magnum Glasspack 24214 $16.50
THRUSH Boss Turbo 17718 $23.95
HOOKER Competition 21006 $25.95
DYNOMAX Super Turbo 17733 $28.50
DYNOMAX Race Magnum 24215 $31.95
HOOKER Super Competition 21106 $35.95
SUMMIT Fully Welded 630325 $38.69
FLOWTECH Afterburner 50322 $39.95

MUFFLER FLOW TEST

MUFFLER Flow at 28-in H20
DynoMax Race Magnum 528.64 cfm
Thrush Magnum Glasspack 507.40 cfm
Summit Fully Welded 343.38 cfm
Flowtech Afterburner 342.20 cfm
DynoMax Super Turbo 333.94 cfm
Hooker Competition 232.46 cfm
Hooker Super Competition 320.96 cfm
Summit Turbo 331.16 cfm
Thrush Boss Turbo 297.36 cfm

MUFFLER Idle dB WOT dB
DynoMax Super Turbo 89 123
DynoMax Race Magnum 94 133
Flowtech Afterburner 92 124
Hooker Competion 92 122
Hooker Super Competion 90 125
Summit Turbo 89 124
Summit Fully Welded 92 125
Thrush Boss Turbo 90 123
Thrush Magnum Glasspack 92 128

DYNO TEST
All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.


MUFFLER HP TORQUE 2,500-6,000rpmAverage
Hooker Competition 397.4 381.1 286.8hp/351.9 lb-ft
Thrush Boss Turbo 407.1 384.9 292.1 hp/357.5 lb-ft
DynoMax Race Magnum 409.5 394.3 298.8 hp/366.9 lb-ft
Flowtech Afterburner 409.7 391.2 294.8 hp/361.7 lb-ft
Thrush Glasspack 409.5 389.8 297.7 hp/365.3 lb-ft
Summit Turbo 411.5 386.3 291.5 hp/357.4 lb-ft
DynoMax Super Turbo 412.7 387.2 292.6 hp/358.6 lb-ft
Hooker Super Comp 413.8 387.2 292.8 hp/359.0 lb-ft
Summit Fully Welded 415.4 390.7 295.6 hp/362.4 lb-ft



A few more numbers.

All tests via an independent lab
All tests @ 15 wc

2 Straight Pipe 283 CFM
2 Straight Pipe 365 CFM
2 Straight Pipe 521 CFM

2 Typical Bent tailpipe 268 CFM
2 Typical Bent Tailpipe 417 CFM

2 Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 Cherry Bomb 239 CFM
2 Cherry Bomb 294 CFM

2 Inlet/Outlet Dynomax Super Turbo 278 CFM
2 Inlet/Outlet Ultraflow Bullet 512 CFM
2 Inlet/Outlet Gibson Superflow 267 CFM
2 Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 Inlet/Outlet Thrush CVX 260 CFM
2 Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 Inlet/Outlet Hooker Aero Chamber 324 CFM
2 Inlet/Outlet Hooker Max Flow 521 CFM
2 Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM


Standard OEM 2 Inlet/Outlet 138-152 CFM
Standard OEM 2 Inlet/Outlet 161-197 CFM

__________________________________________________ ______________
http://www.explorerforum.com/forums/....php?p=1891671


+ 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)

johnunit
01-28-2011, 07:20 AM
http://i23.tinypic.com/2r6ofht.jpg
http://i20.tinypic.com/zlcbir.jpg
http://i21.tinypic.com/2vc895d.jpg
http://i21.tinypic.com/xommb7.jpg
http://i23.tinypic.com/spaiav.jpg

rick99601
01-28-2011, 09:13 AM
good info

1987cp
01-28-2011, 12:45 PM
Sticky this!!! And add to it!!!

Now maybe we can be rid of all those lame "which muffler should I buy because I want my stock single exhaust to be louder" threads. :bash:

johnunit
01-28-2011, 01:15 PM
Something that might be useful is getting a list of what mufflers are "clones" of ones on this list.

For instance, Thrush Welded mufflers are just Flowmaster 2-chambers with very minor tweeks.

1987cp
01-28-2011, 04:12 PM
Not a bad thought. I tend to forget the confusion a car-enthusiast newbie has when seeing all the different brands and model names, with no clue how the interior is designed.

I noticed the OP doesn't have info on Corsa mufflers. Not that most GMNers can afford them, but their broadband sound cancellation seems like a really nifty design. And of course brands like Spintech are very popular with racing types and employ yet another variation on the weld-baffles-in-a-clever-arrangement core.

I'd also suggest looking for info on Walker QuetFlows for those who might want a more stockish sound level (not that we know any of those types ... ;) ).

MattsTownCarSS
01-28-2011, 04:27 PM
Something that might be useful is getting a list of what mufflers are "clones" of ones on this list.

For instance, Thrush Welded mufflers are just Flowmaster 2-chambers with very minor tweeks.


actually thrush welded mufflers(debut in 1966) where out before the flowmasters[debut in 1983) 2 chamber mufflers. Flowmaster copied thrush and sold it for double the price. but thrush welded are the originals.

johnunit
01-28-2011, 04:59 PM
fair enough.

The point was that you could expect similar numbers to the flowmaster 2-chambers if you go Thrush Welded. Incidentily, I just bought some Thrush Weldeds...

MattsTownCarSS
01-28-2011, 07:53 PM
fair enough.

The point was that you could expect similar numbers to the flowmaster 2-chambers if you go Thrush Welded. Incidentily, I just bought some Thrush Weldeds...



i wont lie to you but the thrush welded mufflers are great. i am pleased with the sound they give and they sound nasty when full throttle.

zoomie
01-28-2011, 08:58 PM
I really like glasspacks.......

1980c10
01-28-2011, 09:30 PM
I have slp lm1's on my car. They sound wicked nasty and flow a ton. But they are not technically mufflers, more like resonators/expansion chambers. But I love them. Though at times I have considered going to the dynomax super turbo to quiet it down some, the slp's get a little over bearing on long trips.

packman
01-29-2011, 12:22 PM
....I'd also suggest looking for info on Walker QuetFlows for those who might want a more stockish sound level (not that we know any of those types ... ;) ).

Do they make these in 2.5" sizes? If I ever replace both of the Summit welded muffs, I might consider these. I'm not sure what caused my Summit muff to fail, but I probably won't use them if I have to re-install the exhaust.


Packman

sly
01-29-2011, 09:41 PM
too bad they didn't have magnaflows in that list. I'd like to see how they compared. I rather like my mellow magnaflows.

1987cp
01-31-2011, 06:57 AM
Do they make these in 2.5" sizes? If I ever replace both of the Summit welded muffs, I might consider these. I'm not sure what caused my Summit muff to fail, but I probably won't use them if I have to re-install the exhaust.


Packman

I did find a 2.5" offset/offset in the Walker catalog. It's for some '90-ish Cadillac single exhaust application. I've got the PN posted somewhere - I think. If not, I can get it from the catalog again. They're expensiveish (~$95 IIRC), but no more so than many popular "performance" mufflers. Was thinking of getting some when the Super Turbos showed up on closeout at Rock Auto for something crazy like $27 each - and helped me verify that my resonance problem is almost entirely in the pipes. :crazy:

P72Ford
01-31-2011, 07:24 PM
Flow numbers...

I'd like to see delta p's.

johnunit
01-31-2011, 07:36 PM
what's the functional difference? Wouldn't it be at a given CFM, which would indicate a very similar aspect of the restriction caused?

P72Ford
01-31-2011, 08:12 PM
It would be dependent on volumetric flow rate, but to me it is definitely worth mentioning.

More useful would be a plot of how pressure differential changes as volumetric flow rate increases.