GMMG or duals?
TECH Fanatic
Joined: Nov 2001
Posts: 1,098
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From: I-L-L-I-N-O-I-S
Originally Posted by TheBlurLS1
My facts are straight. I've heard 2 cars with 3 different setups using cats and GMMG. One was bolton (which I installed), the other was cam only, then installed heads. Sounded a bit un-refined to me with a sprig of rasp while accelerating under load through 2000-3000. Maby my ears are clogged up? 
j/k man 
But check out my video link below and tell me if my GMMG set-up is raspy in any way:
https://ls1tech.com/forums/generation-iii-external-engine/538851-update-added-even-better-gmmg-kooks-lt-s-catted-y-video-clips-8-within.html
Originally Posted by 2000LS1Z28
Hmmm...Let's see...I have that exact set-up (GMMG, Kooks LT's, catted Y) and there is no rasp whatsoever at any rpm range...Anyone who's heard my car in person can verify that (again, it's the ORY that will create the rasp on an LS1). And of all the years I've been on this board, I've never heard of anyone complain about any rasp with a GMMG/LT header set-up running cats?? Maybe your hearing does need to be checked? j/k man
But check out my video link below and tell me if my GMMG set-up is raspy in any way:
https://ls1tech.com/forums/showthread.php?t=538851
j/k man But check out my video link below and tell me if my GMMG set-up is raspy in any way:
https://ls1tech.com/forums/showthread.php?t=538851
BTW - I watched your video last night and it sounds awesome from inside the car, there's no doubt there. Behind the car they take on a different tone, especially when casually driving. This is what I've found in my experience.
Originally Posted by 2000LS1Z28
Hmmm...Let's see...I have that exact set-up (GMMG, Kooks LT's, catted Y) and there is no rasp whatsoever at any rpm range...Anyone who's heard my car in person can verify that (again, it's the ORY that will create the rasp on an LS1). And of all the years I've been on this board, I've never heard of anyone complain about any rasp with a GMMG/LT header set-up running cats?? Maybe your hearing does need to be checked? j/k man
j/k man 
