The most commonly used metals in the manufacture of exhaust systems are rusty mild steel, aluminized steel or an inferior 400-series stainless. BORLA uses only high quality austenitic stainless steel. It costs more than the other lesser grades of steel. To cut, bend and hand weld this grade of stainless steel takes special equipment too. Ask your local muffler shop if they can make a smooth, precision mandrel bend in a 2.50" 201 or 304 Stainless Steel pipe for you. You won't find many that can, and it won't be cheap. We also focus heavily on research and development to assure that the system fits, performs and sounds better than any other system on the market. Add to this pressure testing, our Million-Mile Warranty and the years of race winning technology that go into the systems made at BORLA, and you will see why we have so many loyal, repeat customers. A BORLA is actually very cost effective when you take into account the fact that most exhaust systems will need replacement within 18 months to 4 years while a BORLA exhaust is designed to last the life of your vehicle.