Borla 40659 Universal Turbo Center/Offset Muffler Made of corrosion resistant aircraft quality stainless steel which decreases the fatigue incurred on these parts during high performance uses BORLA uses patented straight-through and multi-core technology to help increase horsepower and torque. Precision manufactured using aircraft-quality stainless steel, guaranteed to look like new for one million miles. Inlet diameter: 2.5 inch outlet diameter: 2.5 inch; case size: 14" x 4 1/4" x 7 7/8"