I used own a megan racing universal muffler.
It was 4" tip and 2.5 inlet. I guess the size of the muffler is the same as the catback's muffler. It sounds deep and smooth, but my girl friend didn't like it becuz it was too loud when i go up hills or when the engine get hot.
If it is a catback system, it will be louder than just the muffler.
So if you want it to be loud and deep, go for it cuz it is a good choice for the price.