aFe Power Large Bore-HD 4" 409 Stainless Steel Cat-Back Exhaust System GM Duramax 06-07

aFe offers multiple diesel exhaust systems options for the Dodge Cummins, Ford Powerstroke, and GM Duramax. Upgrading your stock exhaust system to our 4" or 5" diameter diesel exhaust system will help lower Exhaust Gas Temperature (EGTs), while increasing horsepower and torque. Some of the available options are Aluminized or Stainless Steel, Black or Polished Tip, and Dual or Single exit style.