American Muscle has that same catback for $20 cheaper. Also, it will do nothing for you car in terms of power. You are keeping the Y-pipe. All you will accomplish with that catback is making your car sound like a fluffy fart.
Anything is better than my current stock exhaust! Although, is the sound really that bad? It won't arrive until the 3/14, but one reason I ordered it was because I did not have to use debit card at advanced auto. Which exhaust would you have suggested? I listened to a few loudmouth model's and they sounded fantastic.