GMMG with E-cutout! Is it worth it?
I have QTP LT's, Mufflex ORY, GMMG right not, I will be installing H/C/LS6 and adding dual cutouts in the Y pipe, I will let you guys know what my gains are, will be about a month or 2 though before I'm done 
Teching In
Joined: Apr 2004
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Originally Posted by Hardtop00SS
I have QTP LT's, Mufflex ORY, GMMG right not, I will be installing H/C/LS6 and adding dual cutouts in the Y pipe, I will let you guys know what my gains are, will be about a month or 2 though before I'm done
Thread Starter
On The Tree
Joined: Mar 2004
Posts: 177
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From: San Fernando, CA
Originally Posted by 2000LS1Z28
I just can't understand why some of you guys would pay all of that money for a GMMG system only to throw a cutout on the I-pipe... 
The cutout is very noticeably louder INSIDE the car no doubt (of course, dumping anything under the car will be 
). However, outside the car, the GMMG is basically as loud (a little quieter at idle), but with a MUCH better tone than the cutout, Loudmouth, or wide-open Borla. That's the thing about the GMMG cat-back...Surprisingly quiet inside the car at idle or cruise, but sounds completely different outside the car (very deep & muscular). Loud, yet refined! 
Trust me, I too thought it has sounded fairly tame inside the car on every one of my Camaro's I've had it on while running around town until I got to hear it outside the car... 
And whomever said headers & highflow cats dramatically improve the tone/volume is 100% correct. Kooks LT's + a highflow catted Y-pipe made a HUGE difference in how my '02 sounded afterwards! 
Can't wait to get some Mac's for my LT1. 
BTW, you won't gain hardly anything on a stock or near stockish car with an open cutout over the GMMG (it flows very, very well). And even on a highly modified set-up, you'll only give up maybe 5 horses to the rear wheels at the most with the GMMG which is truly awesome.
My vote is the GMMG + headers/highflow cats + a nice cam.
The cutout is very noticeably louder INSIDE the car no doubt (of course, dumping anything under the car will be ). However, outside the car, the GMMG is basically as loud (a little quieter at idle), but with a MUCH better tone than the cutout, Loudmouth, or wide-open Borla. That's the thing about the GMMG cat-back...Surprisingly quiet inside the car at idle or cruise, but sounds completely different outside the car (very deep & muscular). Loud, yet refined! Trust me, I too thought it has sounded fairly tame inside the car on every one of my Camaro's I've had it on while running around town until I got to hear it outside the car... And whomever said headers & highflow cats dramatically improve the tone/volume is 100% correct. Kooks LT's + a highflow catted Y-pipe made a HUGE difference in how my '02 sounded afterwards! Can't wait to get some Mac's for my LT1. BTW, you won't gain hardly anything on a stock or near stockish car with an open cutout over the GMMG (it flows very, very well). And even on a highly modified set-up, you'll only give up maybe 5 horses to the rear wheels at the most with the GMMG which is truly awesome.
My vote is the GMMG + headers/highflow cats + a nice cam.
