Any muffler thats straight through will be loud...espeacially if you have a cat back with out a res. the res cuts noise just as much as your muffler. The cat doesn't cut noise (maybe 5%) but helps performance if your boosted or really well built. If your really concerned and have a little extra cash, I would suggest a double pass Mugen muffler. Its not a straight through muff but acts like one and cuts the decipals to almost nothing.