BORLA XR-1 SPORTSMAN RACING MUFFLER, STAINLESS STEEL, NATURAL FINISH, SOLD INDIVIDUALLY -- 3 in. inlet and outlet diameter; Single center inlet and outlet configuration; 5 in. case diameter, 15 in. case length; Round casing; Made from aircraft-quality, 100 percent T-304 austenitic, sound-absorbing and ultra-smooth mandrel-bent stainless steel that maintains low decibels and protects against burnout; Dyno-proven, insulated to reduce shell temperature for a cooler driver's compartment; Increases flow and power; Features a patented uninterrupted-flow design and multi-core technology; All race venues requiring highest flow muffler, space allowing.