she will get use to the noise, its prob not even that loud haha, wait till you hear my 180sx, rb20 no cat 3inch all the way then twin 2.5 inch tips.
also do you know what exhaust system you have atm, like is it straight 3inch from cat or does it have a muffler also. and how loud we are talking about here if you can explain.
but if you really have to. just do what bubba said to do, should cost a few hundred, depending if you have stainless or mild steel. not sure on what brand but i am sure the exhaust place should help you out.
there is a cheaper way but it looks funny, is putting a silencer on the tip of the cannon (if you have one)