My mate had a RX4 with a 13B NA engine. This car had the maddest exhaust I've ever seen. Twin 3.5" dumps from the engine right the way through, There were two hot dogs per outlet so 4 in total, this went back into a truck muffler with twin outlets. I've never heard anything louder. Outside it was loud, inside wasn't too bad btu what do you expect from that setup...
That car was fast. 12K RPM redline from a professionally built setup...