Like said

 

This probably won't help much:
Corsa flows: 795.6 CFM
Stock flows: 384.9 CFM
hth
-b

 

How much gain is that. 15hp???

 

Best sounding is a very personal opinion. I love how my Dynomax ulraflo is deep and somewhat quiet at idle for a heads/cam car. But still has a throaty roar at WOT with Mac midlentghs. So that setup gets my vote. On the opposite end. I dislike the raspy scream of a Flowmaster setup. I've heard some cars with Corsa exhaust that sounded nice. I've never heard the GMMG chambered doohicky in person but supposedly that is the "best" muffler for the 4th gens. Pretty much all after market mufflers will get you good gains... I am not one to nitpick over 1-5 HP so I would get the one that sounded best to you.

 

Sound is subjective. Figure your price range, figure out what exhausts are in that range, do a search by subject on each one and see if it comes up with sound clips/vids.

You're not going to get an answer, just opinions...

 

Pretty much the same with any thread with "best" in the subject.

 

Well i figured that . I just was seeing what others thought, you know.

 

GMMG................nuff said