Corsa or GMMG
I'm surprised at you 
GMMG and Corsa are two completely different animals. They sound absolutely nothing alike. I've never heard a GMMG in person that I know of for sure, although I think I've seen and heard it once on an F-body...but I can't be sure...he was just driving by and it looked like he had it...
Anyway, the GMMG is much deeper than Corsa. Every clip of GMMG I've ever heard sounds like any other V8 out there. I think it kind of sounds like a V8 truck - it sounds good, but it's not racy at all. I like a more "tinny" exhaust note, kind of like that famous Flowmaster sounds - it has that aluminum-like high pitchedness to it...if you can understand that. GMMG just sounds like a truck with a catback from what I've heard...IMO...
Corsa is by far the most unique catback out there for the F-body. It sounds nothing like any other V8 out there, and it is much more "racy" than then GMMG. However, it's crazy expensive. The Corsa was on my car when I bought it. I think it sounds pretty good, but I don't know if I'd pay $1,000+ for it. It's up to you. There's a sound clip of it in my profile when I had stock manifolds and cats, but the clip doesn't sound exactly like it did in real life. Cameras just don't do it justice.
I'm surprised at you 
GMMG and Corsa are two completely different animals. They sound absolutely nothing alike. I've never heard a GMMG in person that I know of for sure, although I think I've seen and heard it once on an F-body...but I can't be sure...he was just driving by and it looked like he had it...
Anyway, the GMMG is much deeper than Corsa. Every clip of GMMG I've ever heard sounds like any other V8 out there. I think it kind of sounds like a V8 truck - it sounds good, but it's not racy at all. I like a more "tinny" exhaust note, kind of like that famous Flowmaster sounds - it has that aluminum-like high pitchedness to it...if you can understand that. GMMG just sounds like a truck with a catback from what I've heard...IMO...
Corsa is by far the most unique catback out there for the F-body. It sounds nothing like any other V8 out there, and it is much more "racy" than then GMMG. However, it's crazy expensive. The Corsa was on my car when I bought it. I think it sounds pretty good, but I don't know if I'd pay $1,000+ for it. It's up to you. There's a sound clip of it in my profile when I had stock manifolds and cats, but the clip doesn't sound exactly like it did in real life. Cameras just don't do it justice.
That's my opinion on lowering springs for these cars
The 'Low Rider' look doesn't belong on an F-body. It belongs on a primered Civic.F-body's are V8 muscle cars. Sound is what is important, not how well you can drag the exhaust on the ground. You're going to give up the best muscle car sound out there to make your car drag on the ground like the Fast and the Furious? Hey man, it's your car...sorry to see you want to give that up...
That's my opinion on lowering springs for these cars
The 'Low Rider' look doesn't belong on an F-body. It belongs on a primered Civic.F-body's are V8 muscle cars. Sound is what is important, not how well you can drag the exhaust on the ground. You're going to give up the best muscle car sound out there to make your car drag on the ground like the Fast and the Furious? Hey man, it's your car...sorry to see you want to give that up...

Not sure if i am giving it up yet. Been doing some research and Y pipes are GARBAGE!!


The Best V8 Stories One Small Block at Time
but as you can see i kept the tips 
Now i want to go back to a Y Pipe and a c/b... It is either GMMG or Corsa....
As for the Corsa vs. GMMG I would take the Corsa myself. But its all preference what sounds good to one may not to another.



