How does this exhaust sound on a stock LT1? The car will have stock manifolds, ypipe and cat. I am familiar with the LS1, but I don't know much about the LT1s. I am helping my uncle decide on which catback to get for his newly aquired LT1. If any of you have sound clips, please post them. Thanks in advance.

 

got bored did a search on yahoo for u...found this http://gepetto.reanimator.org/Z28/gmmg_sounds/ hope it helps

 

LT1s make a deeper tone, it will always be louder then an LS1

 

I have the GMMG, and I just fired up the LT1 in the garage today since I am on spring break. I have an otherwise stock exhaust and it sounds astonishing, its a great deep sound that when you stand at the rear of the car you can feel the bass in your chest, but you dont hear ressonance in the cabin...here is a review I did on it a while ago:Here is my short evaluation of The GMMG Chambered Exhaust System:

I bought my GMMG chambered exhaust for $500 used from a Texan LS1 owner. I got my it installed and custom fitted a few weeks before I put my car in for winter. My friend's father Dale used to run his own body shop and now just does work on the side for friends, so he helped me install it. The I-Pipe I recieved from the previous owner was all fugged up (mutiple poor welds), so we tossed it and he just welded the assembly on from just after where the I-Pipe curves to make it over the axle. I figure minimal loss using the stock pipe since it is stainless steel and only a 1/4 smaller diamter anyways. He fabricated the new hangers from the ones we cut off the stock exhaust, since the LS1 hangers do not fit correctly. All said and done he just pried the thing to get the tips even and poof, a badass flowing and sounding catback. GMMG offered to sell me a LS1 to LT1 conversion kit for <$20. They also offered to sell me an I-Pipe, but as it turned out, I needed neither.

So, now my car has attitude, how about performance? HELL YEA performance!!! I felt....and yes, I do have a detailed working central nervous system, as most humans do, that allows my body to feel changes in my environment, so don't give me any bullpucky about not being able to feel a gain...anyways...I felt a very noticable differnce in power through all rpm's. The bowtie beast just pulled harded whenever pressure was applied to the gas pedal. I was quoted a 12-16 rwhp gain estimate from a GMMG techie with my otherwise stock platform and I definately felt it. He also noted that in one instance a GMMG owner tried using a cut-out with the catback on a "drag utilized modded big-block" and got decimal dyno gains. Free flowing for damn sure, it basically uses hollow pipes with small dimples for a "muffler."

Now the sound of this catback...well it sounds good like hooker and borla....WRONG it sounds incredible many times better than others, a consitant deep rumble at idle and a mean commanding hellaish scream at "extreme acceleration." It keeps deep and mean tone all of the time. You cannot even fathom the greatness of this exhaust's sound unless you've hear it in person. I figured it would sound pretty good considering the clips I had heard, but in person, it is unreal, simply unsurpassed. The tone at driving RPM from 1500-3500 is perfect for crusing even on a highway, just a tap on the gas and the 350 roars to life.

Oh yea, and it looks sweet too, I have the oval tips which are unique and really compliment the rear of the car nicely. The crossover piping is unique only to this system, very impressive. Great overall system made of quality materials and engineered flawlessly. I would highly recommend this catback to anyone who is interested an awesome exhaust tone and seat-of-the-pants performance. I'll have a website with pics up sometime soon. Yes I have video clips with sound, none from my Z yet, but several from other LT1's and LS1's. Here is GMMG's site for more information, enjoy the custom cars as well as the chambered exhaust. http://www.gmmginc.net/


Hope this helps

-Dustin-

 

Well, I've developed this ritual of whenever I start my car in the morning I kneel down behind my exhaust and bow numerous times.

But I also have headers so that probably affects the sound a bit.


^^^I couldnt make up my mind

 

What does GMMG stand for and how much is it? Thanks

 

It sounds awesome. I've had it since it was called Braxxton, about 3 years, and the rest of the car is stock. I have received tons of complements.

 

GM Motorsports Group

 

Oh god I can't wait to get mine this summer!!!!!!

 

Thanks for all the replies! I drove the car today and it does have more of a rumble to it than the LS1. I can't wait to hear it with the catback. I think its GMMG time