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11-21-2006, 09:55 PM
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#1
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Registered User
Join Date: Nov 2005
Location: BP MN
Posts: 135
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GMMG vs other catbacks
I've been looking at catbacks and was wondering how well the GMMG system compares to others performance wise. I know it produces the best sound around, but does it flow as well as systems such as corsa and magnaflow? Does it sacrifice any power for sound?
Thanks,
Jeff
__________________
99 SS M6
Pro 5.0, Bilstein Susp, SLP Lid, ARH 1 3/4" LT's & Catted Y, Mad Tuner tune, Magnaflow 
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11-21-2006, 10:50 PM
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#2
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Registered User
Premium Member
Join Date: Apr 2005
Location: Bellevue, Nebraska
Posts: 1,529
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http://www.gmmginc.net/html/chamberedexhaust.html
Well its 3" mandrel bent tubeing, just like the others, it has 2 mufflers rather than 1 so you would think it flows a little better and they says it dyno tuned to improve hp. And since GMMG has been specializeing in building high hp F-body cars for years now, you'd think they know what they are doing and are pretty damn good at it. Im sure it outflows all other types of exhaust except true duals. Even if it doesn't flow as well as either borla or corsa, the sound alone will make up for it.
__________________
1996 Z28 SS clone. A4,Black,Leather,All options,Hardtop
Pacesetter LT's,ORY,Trickflow elbow,NOS Holley 58mm TB,Moroso CAI,GMMG,DMH cutout,Dyno tune,!CATS,!AIR,!EGR,TB bypass,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall.Dyno #'s 263.87hp 268.44ft/lbs.Best 1/8 mile time 8.419@81.92mph 1.796 60' on 315/30/18 BFG DR's at 3560lbs. In the works, procharged 383
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11-21-2006, 11:06 PM
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#3
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Registered User
Join Date: Nov 2005
Posts: 321
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Just buy it and you'll thank me later.
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- 1996 Formula WS6 - 12.64 @ 111.88 w/1.92 60' - stock bottom end - LE2 400 rwhp - GMMG - BMR - TTII's - 315's (Shakedown pass with a terrible miss up top)
- 2005 GMC Sierra Z71 - 16.11 @ 86.04 w/2.13 60' - stock for now!
www.fquick.com/scrmnws6
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11-21-2006, 11:31 PM
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#4
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Registered User
Join Date: Sep 1998
Location: US 1 Mile Marker 52 in the Florida Keys
Posts: 8,524
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the difference between the worst flowing and the best flowing exhaust is only about 5hp...
so basically...you'll never know the difference...
buy it for the sound...material...and cost 
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ARREST-ME RED 99 Z-28, M6 - TSP Torquer V1 (233/233 .589" 112*), HS rockers, Flowtech LTs, 3" TDs, magnaflow 4x9s, FAST 90/90 ported, Mez EWP, 160 stat, SSRA, TSP lid, GMS maf ends, ASP pulley, Hurst w/LSS, Spec4, Fidanza FW, SS brake lines, BMR lca w/ brackets, phb, stb, 32/21mm swaybars, sfc, ZR1s
408.6 hp, 379.5 torque
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11-22-2006, 12:06 AM
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#5
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Registered User
Join Date: Nov 2005
Location: BP MN
Posts: 135
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Sounds good, thanks for the replys.
Now i just need to find some funds for the GMMG
__________________
99 SS M6
Pro 5.0, Bilstein Susp, SLP Lid, ARH 1 3/4" LT's & Catted Y, Mad Tuner tune, Magnaflow
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11-22-2006, 02:23 AM
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#6
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Registered User
Join Date: Jan 2006
Location: Bettendorf, IA
Posts: 889
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Quote:
Originally Posted by scrmnws6
Just buy it and you'll thank me later.
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Hes right, you will thank him
__________________
-Chris- '95 Z28 A4,'01 Silverado(DD), '03 R6 Black/Red,
-HSW Wet Kit, Mallory 685, TrickFlow, GMMG, DMH E-Cutout, 3.73's, Racetronix FP, PcmForLess Tune, Built 4L60E, Koni's, Strano Springs, UMI Adj Phb, UMI LCA's, BMR Stb
"Real Cars Don't Make Power At The Front Wheels, They Lift Them"
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11-22-2006, 12:57 PM
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#7
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Registered User
Premium Member
Join Date: Apr 2005
Location: Bellevue, Nebraska
Posts: 1,529
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Quote:
Originally Posted by GnarlyZ28
Sounds good, thanks for the replys.
Now i just need to find some funds for the GMMG |
I found mine over on LS1tech.com for $450 with the famous oval tips. I got a hellova deal. Just keep an eye out and you can too.
__________________
1996 Z28 SS clone. A4,Black,Leather,All options,Hardtop
Pacesetter LT's,ORY,Trickflow elbow,NOS Holley 58mm TB,Moroso CAI,GMMG,DMH cutout,Dyno tune,!CATS,!AIR,!EGR,TB bypass,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall.Dyno #'s 263.87hp 268.44ft/lbs.Best 1/8 mile time 8.419@81.92mph 1.796 60' on 315/30/18 BFG DR's at 3560lbs. In the works, procharged 383
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11-22-2006, 07:57 PM
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#8
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Registered User
Premium Member
Join Date: Sep 2003
Location: The Wild West
Posts: 5,078
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If you do a search using my name and GMMG or something to that effect youll find the huge thread I made on the GMMG. Its second to none for catbacks. I got mine for $500 with ovals, and I have used GMMG's customer service and its wonderful. Its nice to be able to deal with a small company that you can lean peoples first names and speak with them, then see them in magazine articles. LT1 PWR did a good job with his post.
-Dustin-
__________________
1994 Z28 - 4L80 - 9"
1995 Z28 - T56
1997 5.9L Cummins
2003 7.3L Powerstroke
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11-22-2006, 11:35 PM
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#9
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Registered User
Join Date: Nov 2005
Location: BP MN
Posts: 135
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Well i'm kinda stuck here on either the corsa or the gmmg. I know they both flow equally well and wont make any measurable differnece in HP. My only resource right now are sound files which i know dont do exhaust systems any justice. How do they sound in person?
Thanks.
__________________
99 SS M6
Pro 5.0, Bilstein Susp, SLP Lid, ARH 1 3/4" LT's & Catted Y, Mad Tuner tune, Magnaflow
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11-22-2006, 11:41 PM
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#10
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Registered User
Join Date: May 2002
Location: New Orleans, LA
Posts: 1,422
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heard corsa, was good, but eh... like my hookers more...
havnt heard gmmg, cept ls1sounds.com but my friend said it was amazing, everyone else does, and it sounds hawt on ls1sounds.com too
cory
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LS1 TR224-112, 12 bolt
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11-23-2006, 12:31 AM
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#11
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Registered User
Premium Member
Join Date: Apr 2005
Location: Bellevue, Nebraska
Posts: 1,529
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Video clips can never do an exhaust system justice. But trust me, GMMG is the best sounding exhaust system available for f-body's, especially LT1's. GMMG+LT1=Audible sex. I almost got a hard on when i first fired it up after the install. Even my dad said "now thats the way a muscle car should sound". You will not be disapointed with the GMMG.
__________________
1996 Z28 SS clone. A4,Black,Leather,All options,Hardtop
Pacesetter LT's,ORY,Trickflow elbow,NOS Holley 58mm TB,Moroso CAI,GMMG,DMH cutout,Dyno tune,!CATS,!AIR,!EGR,TB bypass,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall.Dyno #'s 263.87hp 268.44ft/lbs.Best 1/8 mile time 8.419@81.92mph 1.796 60' on 315/30/18 BFG DR's at 3560lbs. In the works, procharged 383
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11-23-2006, 10:50 AM
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#12
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Registered User
Join Date: Nov 2005
Posts: 321
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You will NOT be dissapointed with the GMMG exhaust. You will NOT be dissapointed with the GMMG exhaust.
I've said it twice, and Ill say it again...
You will NOT be dissapointed with the GMMG exhaust.
Peoplpe everywhere will be giving you compliments about the exhaust. Just think of it this way... if you do go with Corsa, thats great. But then when you will finally hear a GMMG exhaust in person, you will literally ask a stranger to kick you in the ass for your dumbheaded purchase... yeah, thats how much you'll want a GMMG after hearing it.
__________________
- 1996 Formula WS6 - 12.64 @ 111.88 w/1.92 60' - stock bottom end - LE2 400 rwhp - GMMG - BMR - TTII's - 315's (Shakedown pass with a terrible miss up top)
- 2005 GMC Sierra Z71 - 16.11 @ 86.04 w/2.13 60' - stock for now!
www.fquick.com/scrmnws6
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11-23-2006, 01:36 PM
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#13
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Registered User
Join Date: Dec 2003
Location: NY...what a bad place for a nice car
Posts: 2,126
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GMMG
(ive already explained this to him so i wont add anything further)
__________________
1997 30th SS, Jethotts/catts/GMMG, GM847 on 1.6rr, PMP Ported heads w/larger valves, 4L80E, Dana 60, Custom tubular Tq Arm. Machined 350 with Forged rods/pistons aftermarket crank ZEX Dry 125,160 thermostat
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11-23-2006, 06:52 PM
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#14
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Registered User
Premium Member
Join Date: Sep 2003
Location: The Wild West
Posts: 5,078
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Corsa sound doesnt even come close to the GMMG. I'd bet it doesnt flow as well either.
-Dustin-
__________________
1994 Z28 - 4L80 - 9"
1995 Z28 - T56
1997 5.9L Cummins
2003 7.3L Powerstroke
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11-23-2006, 07:52 PM
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#15
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Registered User
Join Date: Dec 2003
Location: NY...what a bad place for a nice car
Posts: 2,126
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Quote:
Originally Posted by Bersaglieri
Corsa sound doesnt even come close to the GMMG. I'd bet it doesnt flow as well either.
-Dustin-
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not sure
but isnt corsa a straight through design anyways,
going through a muffler still can do somthing concering power but it can all equal out with the sharp bends made on the GMMG
either way both exhaust are really nice peices of equipment that flow VERY well
the only difference really is sound and well GMMG is top in that category
__________________
1997 30th SS, Jethotts/catts/GMMG, GM847 on 1.6rr, PMP Ported heads w/larger valves, 4L80E, Dana 60, Custom tubular Tq Arm. Machined 350 with Forged rods/pistons aftermarket crank ZEX Dry 125,160 thermostat
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