Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

true duals v. gmmg !??!?!!

Thread Tools
 
Search this Thread
 
Old Feb 26, 2003 | 01:20 AM
  #1  
pimpmaro's Avatar
Thread Starter
TECH Fanatic
 
Joined: Feb 2003
Posts: 1,586
Likes: 0
From: Columbus, OH
Default true duals v. gmmg !??!?!!

About to replace stock exhaust on my z28 and I'm tryin to decide b/w custom true duals and the gmmg cat-back. I've heard alot of good things about both the gmmg and duals, but I've also heard duals have clearance problems. I'm just wondering what kind of power(mainly)/sound differences there are bw the two. TIA

PS: if it helps, my next plan is mac mid or long tubes with high flow cats
Reply
Old Feb 26, 2003 | 06:48 AM
  #2  
akaceril's Avatar
TECH Senior Member
 
Joined: Sep 2002
Posts: 7,064
Likes: 0
From: Tacoma, WA
Default Re: true duals v. gmmg !??!?!!

you should get the true duals after you get headers. Check my sig for mine. I am switching over to duals pretty soon. I used to have the gmmg, sounded good but not loud enough for me. so I got the LM. you will gain a few more ponys if you get true duals with an x-pipe. and it might be cheaper than a cat-back system. you will just have to ask around your local shops. as for clearance problems, if your car is lowered, you might. it mostly depends on what mufflers you get, and how much you tuck the pipes up.
Reply
Old Feb 26, 2003 | 10:32 PM
  #3  
2001CamaroGuy's Avatar
TECH Veteran
iTrader: (6)
 
Joined: Feb 2002
Posts: 4,766
Likes: 0
From: Phoenix, AZ USA
Default Re: true duals v. gmmg !??!?!!

TRUE DUEL!!!!!!!!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />


Once you get it, you will never want anything else. Before I got mine, I had a B&B, a Flowmaster 80 series, and finally a Loudmouth. The Loudmouth was LOUD, but it just didn't sound like a muscle car.

I have some friends who have .....hmmmm....rustangs.....hmmmmm.....and I always loved the way they sounded. I think a rock moves faster than their cars but....hey....who said that.... <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" /> . Once I got mine.....awwwwwww....so nice....now I have the sound to go along with all that beautiful LS1 power <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> .

Chris
Reply
Old Feb 26, 2003 | 11:17 PM
  #4  
Classic's Avatar
TECH Fanatic
iTrader: (3)
 
Joined: Sep 2002
Posts: 1,943
Likes: 0
From: NC
Default Re: true duals v. gmmg !??!?!!

I love my GMMG. I have heard the true duals on a friends car and I can honestly say I didn't like it as much as I thought I would. My dream exhaust would be true duals with chambered sections instead of the typical bullet mufflers. Now that is an exhaust I could live with.

By the way - if you haven't heard a GMMG you are always welcome to stop by and listen to mine <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Reply
Old Feb 27, 2003 | 12:38 AM
  #5  
pimpmaro's Avatar
Thread Starter
TECH Fanatic
 
Joined: Feb 2003
Posts: 1,586
Likes: 0
From: Columbus, OH
Default Re: true duals v. gmmg !??!?!!

I've heard so many good things about both. Right now, the big prohibitive thing is cost. The gmmg is damn expensive... altho I don't know offhand what a custom dual would run. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Does anyone have any sound clips of the exhausts... maybe even an SLP. (hehe, much less expensive)... 'Preciate it.
Reply
Old Feb 27, 2003 | 12:49 AM
  #6  
ArcticFormula's Avatar
12 Second Club
 
Joined: Dec 2001
Posts: 931
Likes: 0
From: Santa Clarita, CA
Default Re: true duals v. gmmg !??!?!!

Unless there is some other extreme need, I want maximum ground clearance, and when I got my cat-back, true duels were not discussed to this extent (as I remember). I like the sound of my GMMG, but think I need ORPs to wake the neighbors.
Regards,
John
Reply
Old Feb 27, 2003 | 10:58 AM
  #7  
LastHawk's Avatar
On The Tree
 
Joined: Sep 2002
Posts: 147
Likes: 0
From: San Antonio, Texas
Default Re: true duals v. gmmg !??!?!!

I have the GMMG now but in the future I will probably go to true duals. In another post a few up from this one they discuss some new mufflers. One type was a 24" or 30" chambred muffler. I wonder what those would sound like with duals? I reallly like the GMMG sound, but want to make it louder, but keep the quality too.

<small>[ February 27, 2003, 11:01 AM: Message edited by: LastHawk ]</small>
Reply
Old Feb 27, 2003 | 01:07 PM
  #8  
pimpmaro's Avatar
Thread Starter
TECH Fanatic
 
Joined: Feb 2003
Posts: 1,586
Likes: 0
From: Columbus, OH
Default Re: true duals v. gmmg !??!?!!

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LastHawk:
<strong> I have the GMMG now but in the future I will probably go to true duals. In another post a few up from this one they discuss some new mufflers. One type was a 24" or 30" chambred muffler. I wonder what those would sound like with duals? I reallly like the GMMG sound, but want to make it louder, but keep the quality too. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yeah, I saw that thread too. I seem to remember that getting sections of chambered pipe was really inexpensive too... Does anyone else remember that thread?
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Feb 27, 2003 | 01:08 PM
  #9  
pimpmaro's Avatar
Thread Starter
TECH Fanatic
 
Joined: Feb 2003
Posts: 1,586
Likes: 0
From: Columbus, OH
Default Re: true duals v. gmmg !??!?!!

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LastHawk:
<strong> I have the GMMG now but in the future I will probably go to true duals. In another post a few up from this one they discuss some new mufflers. One type was a 24" or 30" chambred muffler. I wonder what those would sound like with duals? I reallly like the GMMG sound, but want to make it louder, but keep the quality too. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yeah, I saw that thread too. I seem to remember that getting sections of chambered pipe was really inexpensive too... Does anyone else remember that thread?
Reply
Old Feb 27, 2003 | 03:43 PM
  #10  
BLK02WS6's Avatar
9 Second Club
iTrader: (2)
 
Joined: Jul 2002
Posts: 2,583
Likes: 1
From: on the dyno tuning in MD
Default Re: true duals v. gmmg !??!?!!

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pimpmaro:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LastHawk:
<strong> I have the GMMG now but in the future I will probably go to true duals. In another post a few up from this one they discuss some new mufflers. One type was a 24" or 30" chambred muffler. I wonder what those would sound like with duals? I reallly like the GMMG sound, but want to make it louder, but keep the quality too. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yeah, I saw that thread too. I seem to remember that getting sections of chambered pipe was really inexpensive too... Does anyone else remember that thread? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It might be the one I wrote - the chambered sections are available from Summit Racing. See their latest catalog or website.

I found out I can't use them (or anything else but a stock appearing cat-back) because of my states stupid emissions laws!! Why can't they just sniff it and pass it if it is clean! I can't even have a cutout.
Reply
Old Feb 27, 2003 | 04:32 PM
  #11  
LS69TA's Avatar
TECH Veteran
iTrader: (30)
 
Joined: Jan 2003
Posts: 4,391
Likes: 0
From: Texarkana, Tx
Default Re: true duals v. gmmg !??!?!!

True Duals!!! I love my 3" duals and Flowmasters. Loud as hell and not too much trouble with ground clearance..the mufflers have only scraped a speed bump a couple of times. <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />
Reply
Old Feb 28, 2003 | 12:34 AM
  #12  
pimpmaro's Avatar
Thread Starter
TECH Fanatic
 
Joined: Feb 2003
Posts: 1,586
Likes: 0
From: Columbus, OH
Default Re: true duals v. gmmg !??!?!!

How much do true duals run? I know it depends on what shop, but does anyone have a rough estimate? Unfortunately money's always the issue... <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />
Reply
Old Feb 28, 2003 | 12:55 AM
  #13  
ISPEEDWS6's Avatar
On The Tree
 
Joined: Dec 2001
Posts: 137
Likes: 0
From: Atlanta, Georgia
Default Re: true duals v. gmmg !??!?!!

True duals can be expensive, depending on the material ie(stainless) or aluminized, and the mufflers. Not worth doing unless your doing with headers. Ground clearence can be a problem or smacking the floor board. Ask Cammin' Beast about it...
The GMMG chambered system is alittle on the high side as far as price, but it blows everyone else's sound away. <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" />
It's compatible with just about any of the aftermarket header and Y pipes, and with off road pipes in in place of the CATS it's PLENTY loud, deep and snotty...not raspy like a loud mouth.If you call and make an appointment car we'll install it for you at no additional cost.
Reply
Old Feb 28, 2003 | 01:20 AM
  #14  
pimpmaro's Avatar
Thread Starter
TECH Fanatic
 
Joined: Feb 2003
Posts: 1,586
Likes: 0
From: Columbus, OH
Default Re: true duals v. gmmg !??!?!!

The gmmg is what I originally was looking at. Do you know what the HP diff between the gmmg and cutouts are? (tryin to decide if I wanna throw cutouts into the mix too... ) <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Reply
Old Feb 28, 2003 | 11:01 PM
  #15  
ISPEEDWS6's Avatar
On The Tree
 
Joined: Dec 2001
Posts: 137
Likes: 0
From: Atlanta, Georgia
Default Re: true duals v. gmmg !??!?!!

I was running long tubes with off road pipe, and a GMMG chambered on my WS6, heads cam blower motor with 10psi and only gained 6 hp with a cutout, I was running a QTP, the noise was cool at times to freak people out, but for 6 ponies for all the work and loot... <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
The GMMG system should be worth 12 @ the wheels over stock Z28 exhaust with no other mods. <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />
Reply
Old Mar 1, 2003 | 12:34 AM
  #16  
guadofreak's Avatar
TECH Enthusiast
iTrader: (1)
 
Joined: Nov 2001
Posts: 590
Likes: 0
From: Tampa, FL
Default Re: true duals v. gmmg !??!?!!

www.sweetthunder.com That is a link to some chambered pipes. There is another company out there(forgot the address) that sell the pipes that are identical to the GMMG pipes.

I think my GMMG w/ LT's and ORy is SWEET!! But in all honesty they are totally different sounds for whatever you taste is. You have to experience it. There are serveral tru dual guys running around my area. I am the only GMMG LT person that i know of at all in FL...i may be wrong though. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ March 01, 2003, 12:35 AM: Message edited by: guadofreak ]</small>
Reply
Old Mar 1, 2003 | 11:06 AM
  #17  
ram-it's Avatar
TECH Fanatic
 
Joined: Nov 2002
Posts: 1,889
Likes: 1
From: Lincolnton, NC
Default Re: true duals v. gmmg !??!?!!

I have the GMMG and love it! I have a little video I can send if you give me your email. However, I don't think you'll be disappointed either way you go. Good Luck.
Reply




All times are GMT -5. The time now is 02:45 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE