My car with a FP Race manifold, ported evo3, ported 2g o2 housing, and 3" catless turboback with just the CM muffler is actually quite quiet. Mass is a big time loud exhaust no-no state and I haven't been hassled.
Add a cat or resonator and it'll be very quiet. My Talon with the same setup other than being a Buschur turboback is much louder. It has a resonator too.