Use this exhaust system when you want to enhance your driving experience on the street or at the stoplight. It's perfect for Ford Mustang Cobra enthusiasts who love a sporty sound and improved performance. The main piping is 2.5 inches in diameter, and it has 3.5 - inch polished clamp - on single - wall angle - cut edge tips. The system replaces your stock exhaust from near the catalytic converter and can be easily installed by yourself.