It all depends on the rest of your exhaust system really. Yes, it is known that a full Apexi N1 cat-back is one of the louder exhausts, however you are talking about jyst the universal muffler. In this case you have to take into account whether or not you are going to leave the stock piping/resonator, or if you are going to be redoing the piping when instaling the muffler.
So let us know what your plans are, and what the rest of your exhaust system is comprised of.