Hmm you never mention what type of car ur driving, what are the piping sizes,.. do you run on stock extractors.. and did you remove the resonator..
pls describe what uv 'done' to ur car.
assuming that everything is stock standard, maybe ur using a straight flow muffler, thats why so noisy. try adding some resonators.
if u have $$$, change ur muffler to an S-type. all (most) standard cars comes with these types. hence u wont notice the exhaust sound.
just my half cents...