X High Performance Exhaust System The Hawk 04-06 BMW 525I / 06-07 BMW 525Xi/530Xi / 08-10 528I / 04-07 530I / 08-09 535Xi / 09-10 535i HPX High Performance Exhaust System is a high-performance exhaust system designed to provide a powerful and aggressive sound, increased power, and improved fuel economy. It features a 3-inch mandrel-bent stainless steel tubing with a high-flow muffler and polished stainless steel tips. This exhaust system is designed to provide maximum flow and performance while still maintaining a street-legal sound level. It also offers an improved look that will give your vehicle a more aggressive look. This system is designed to be a direct fit and requires no modifications for installation.