The performance available from a stock diesel engine can be massively improved by aftermaket parts, that's why this exhaust is designed to work perfectly with Volant's Cold Air Intake to move all the air through the Ford Powerstroke it can handle. The straight through muffler design and the smooth CNC machined mandrel bends along with the dual walled beveled tip, gives it that nice rumble and increase the performance with some serious horsepower without generating that annoying highway drone. Oh yes, and this is a fully polished show piece ready kit!