I also have Magnaflow 2 in 2 out 22'' muffler nice deap rumble at an idle quiet when cruisin and definitly comes alive when you get on it I do still have my cats though

 

Lots of GM dealers are getting demos and\or purchasing catbacks from Corsa and adding 20 inch wheels to dress up show room models. As with myself, folks are reporting having no trouble getting a test or demo ride. Most are getting the sport (louder) edition of the Corsa catback. I have seen and ridden a dual rear exit Sport edition.
What it sounds like you are looking for describes the Corsa Touring (quieter) edition I have on my truck. See my signature.
Just loud enough in the cab at normal city speeds to indicate it is there. At highway cruise speeds it is silent in the cab. When you floor it and it gets to the mid to upper revs it opens up nicely.
I had an SS muffler on a Z71 ECSB. The Corsa is a TAD louder at cruise and much louder when opened up. Corsa reports around 400 CFM increase if not more in fow over the OE SS muffler.
At it's loudest in the cab, one does not need to speak any louder or run the volume up on the audio.
It would be nice to be able to ride in all the different makes of pipes wouldn't it.
Then there is the money of a catback vs. a muffler.

 

if you have the $$$, go Corsa

if not, magnaflow

 

Hey man i got an x-pipe, with true dual flowmasters (1 in 1 out) and having them both dumped right before the axel...sounds great! not to loud at all at idle put loud as **** when u floor it! I recommend it...i got some good pics of the set up if u want it....hit me up Fatneck68@hotmail.com