This MagnaFlow exhaust system is perfect for Ford Mustang owners from 1999 to 2004 who want to enhance their car's performance and sound. Whether you're cruising on the highway or showing off at a car meet, it's a great addition. The main piping is 2.5 inches in diameter, and it has 3 - inch polished clamp - on single - wall angle - cut edge tips. It's easy to install on your own and will give your Mustang a moderate exterior and mild interior sound level.