...what he said. If you run nothing else, these are rumbly at idle and get loud fast when you romp on it. They're essentially the same as glass packs...
2 chamber flows sound good to me-always have, but the drone will make you simple minded after about 3 hrs worth of driving...never really knew about mental fatigue until I compared driving experiences in a quiet car compared to something with loud/droning exhaust. 3 chambers are a little more mellow and quieter. IIRC, the delta flows just had a different resonance to them-still sounded like flowmasters, but...different.
