Borla 04-06 Mini Cooper S (Incl. Convertible) Normal Cat-back 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. Includes a rear exit dual round rolled angle-cut tip