Z'mnypit

iTrader: (58)

Does anyone still have the home made GMMG thread bookmarked or saved? I used the search but it doesnt pull anything. I was curious if anyone has tried it yet.

Cop Car

iTrader: (14)

all the "chambered" exhaust is, is a pipe with dents in it, its essentialy a straight pipe, and thats why it sounds like a 1984 redneck chevy pickup truck.

JDJP

iTrader: (2)

I had made a post about making one using bullets where the chambered exhaust is, but got no replys...
https://ls1tech.com/forums/generation-iii-external-engine/560168-custom-setup.html

LS69TA

iTrader: (30)

I've done something similar to the GMMG on my other 2 LS1s, but didn't run mufflers, just pipe. It didn't have the redneck glasspack sound either.

scrmnws6

iTrader: (7)

Redneck sound? Are you serious? Next thing I know is your're going to be saying that the Corsa sounds like a 10" Honda ricer exhaust!

Ace$nyper

iTrader: (8)

No it's a true story, to alot of people myself included GMMG sounds like *****.

But yea all it is crushed piping, not to hard to replicate.

Z'mnypit

iTrader: (58)

Are you saying the GMMG sounds like a 1984 redneck chevy?

Ive done that when I had stock manifolds and cats, but I wouldnt dare do that now, it would be so loud.

Im wanting to ditch my cutout and hooker and maybe fab up an exhaust like the GMMG. It would be less weight and a better sound. Summit racing carries these for $117 a piece and a local exhaust shop could fab the whole thing for around $100 so It would be way cheaper. What would be the difference in sound from the GMMG if I were to use these and route the piping just like the GMMG? I still plan on keeping my CME also...

http://store.summitracing.com/partde...5&autoview=sku

wannafbody

iTrader: (2)

it could be done- the difficult part is finding a short y for the split

Z'mnypit

iTrader: (58)

All it looks like it 3in pipe flared where two smaller 2.5in pipes are inserted then welded up. It doenst look like an actual Y...

NHRAMAN

iTrader: (1)

heh..heh..heh....pass the beer man.....heh..heh...heh...

Z'mnypit

iTrader: (58)

I also found these, cost a little more but Ive read a couple times now that they supply the mufflers for GMMG (just what Ive read)! Does anybody know what the inlet/outlet size is? Im guessing 2 1/4 or 2 1/2in...

http://www.stainlessworks.net/cart/i...hp?cPath=24_78

NHRAMAN

iTrader: (1)

seen those talked about---would really like to know if they DO make them for GMMG.or they make them themselves.??? ANYBODY actually BEEN to the GMMG factory/shop/store.???????

SS-35th

iTrader: (2)

if you look on that website they have a GMMG style catback for the 98-02 Camaro it sells for $835

Z'mnypit

iTrader: (58)

See thats what I mean, you can buy the parts and have it made for way less then half of that. Im seriously about to have it made, got a couple electrical issues Ive got to sort out first. I just hope it sounds good cause if not thats kinda like $300-$400 wasted.

Cop Car

iTrader: (14)

the pickup would actualy probably sound better and wouldnt have as much ear pearcing sound and 1/2 the drone as GMMG straight pipes.

BlueThunder2

iTrader: (3)

The GMMG exhaust is a tuned exhaust for sound and performance. They actually tried these things on the dyno before they were satisfied with their product. You will be lucky to duplicate it. A lot of time and money was spent making the GMMG exhaust to make it the way it is. The guys at GMMG ran their cars on the dyno with open headers and then full exhaust with the GMMG cat back, and they only lost 3 rear wheel horsepower on a 500+ horsepower car.

Good luck in your efforts, but I would just spend the money on the true GMMG since they did all the research to make such a good product.

Z'mnypit

iTrader: (58)

Well ok.... I guess everyone has an opnion...

orangeapeel

iTrader: (18)

Sw > Gmmg

ChocoTaco369

because...

orangeapeel

iTrader: (18)

That line was just my fish hook to find you.
Actually I made the damn <>> <>< >> << >> thing going the wrong way....should be this.

GMMG > SW