The MBRP 4" Installer Series Turbo-Back Exhaust System is specially built from heavy-duty aluminized steel for your 2003-2007 Ford 6.0L Powerstroke. MBRP's Installer Series exhaust systems offer a value price without compromising on the quality built into every component. While the seams are a major point of rust through with some budget systems, MBRP's fully sealed tubing adds years to your system. Constructed to the same specifications as our top of the line Pro Series MBRP backs this line with an industry leading 3-Year Warranty.