This is the smallest of the ovals to fit a 3" FD3S exhaust with a narrow recessed tip. The welder had to tilt the muffler slightly to keep it from touching the heat shield. It's mounted to a 3" Racing Beat dual-tip exhaust. It used to have an old Rotary Performance muffler. It was a significant upgrade with no discernible performance deficit. Idling is quieter, acceleration is quieter, but cruising is noticeably quieter At full throttle it still has some volume but less than before I'm very happy and would like to do that a few years ago.