I talked to a buddy of mine about this last night. He's owned a couple of Z06 Vettes and currently has an 08' model and attends a lot of car shows and what not.
He told me that Corsa are very good pieces but that they're extremely proud of them (read $$) which I already noticed. His advice was to go with the Magnaflow and put the cash saved toward other upgrades.
As for sound, I don't mind a nice throaty type loud...what I don't want is that crackling popping loud when you get on the gas.
I did have one other thought which was to buy the
non Magnapack system that has the resonators AND mufflers. Then if it's not loud enough I can have a local shop just remove the rear mufflers and replace them with pipe. This system is only $50 more than the Magnapack system from the retailer I've found.
This is Magnapack System:
This is the standard system:
I've only seen one other Challenger in my area and it still had stock exhaust so there's really none I can listen to in person.