Mufflers

I have a 99 cobra and had a quick exhaust question. I was wondering if I changed out the Mufflers on the car would I get close to the same sound that I would out of a cat back system? Hypothetically, Lets say I switched to flowmasters american thunder mufflers, would I get close to the same sound that I would out of the full catback? I am a little low on cash and would be happy if I could get the sound I am looking for, relatively inexpensively. Thanks for the help.
 
Yes, you would. It wont be totally identical, since many catback use stainless steel, and SS resonates a little differently than aluminized. But for all intents and purposes, you or I wouldnt be able to hear the difference.

Go for it :)