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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 06-10-2011, 07:05 AM
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Default Not too loud, but bubbling.

Is there anywhere I can find a db table for the different possible exhausts for a 5.7 HEMI Ram?

I'm looking for one that has a nice bubbling sound when idling, but that is not too loud when driving. Is that possible?

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Old 06-10-2011, 10:06 AM
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I've done numerous mufflers on my truck...short an long magnaflows, flow 50's. I never could get use to the Flowmasters, they sound good at idle and part throttle but when you open her up the sound just doesn't sound right to me.. also tried an 18" mag and it was too much noise in the cab (after it broke in). I now have a 22" mag and love it, sounds quiet and mean enough to get suspicious looks from louder mufflered trucks which i toast at street lights
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Old 06-10-2011, 10:17 AM
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Would you mind posting up a link to the part/catalog # to the 22" Magnaflow you have?
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Old 06-10-2011, 11:38 AM
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This was taken from DF. Credit to HammerZ71

The following is a compilation of some popular mufflers and their CFM rating. Basically, how good they "flow"...


Dodge Ram OEM: 285-355 depending on year and engine.

Walker PF29: 217
Thrush CVX: 260
Thrush Boss Turbo: 297
Gibson Superflow: 311
Hooker Super Competition: 320
Summit Turbo: 331
Flowtech Afterburner: 342
Summit Fully Welded: 343
Flowmaster 40: 352
Flowmaster 50: 362
Dynomax Super Turbo: 410
Cherry Bomb Pro: 470
Cherry Bomb Extreme: 500
Thrush Magnum Glasspack: 507
Cherry Bomb Glasspack: 510
Edelbrock RPM: 579
Cherry Bomb Vortex: 580
Edelbrock 304: 640
Dynomax Race Magnum: 711
Magnaflow 12388: 767
Borla XR-1: 836
Dynomax Ultra Flow SS: 1000

It is important to note that without some engine modifications, too much flow can cause damage and actual decrease performance. It is generally accepted that the maximum rate you should ever try to achieve is 600 cfm on a stock to mildly modded truck, which is the rate air will flow thru a straight 3" diameter pipe.

I was unable to find any data on Magnaflows, if any body has some reliable data on them or any others not listed, PM them to me and I'll add them...

-------
Some sound level comparisons I've been able to find:

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow 14", 77db at idle, 86 at 2,000 rpm, 104db at WOT.
4.Flowmaster 40 series, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).
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Old 08-02-2011, 06:32 PM
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Default Chevy info

Ok, it's been a while, but I found the following info on a chevy forum (http://67-72chevytrucks.com/vboard/s...d.php?t=263014):

I have listed here a muffler shootout test done by CAR CRAFT, they show the best bang for the buck, and show the db's

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








i have another test here on my computer but i don't know how to upload it onto this site because it is in a adobe pdf file.



more numbers for ya'll who like 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

This is not gonna answer the question directly, but at least it will give the opportunity to compare to something known.
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