The MBRP XP Series Single Exhaust System shown here (C6142409) is a T409 Stainless Steel Exhaust System. Alternate Exhaust Systems Installer Series - C6142AL Performance Series - C6142P Features Lifetime Warranty Mirror Polished T304 Stainless Exhaust Tip Includes Muffler Delivers a Rich, Mellow Exhaust Note Installs with Common Hand Tools Can Improve Fuel Economy by 1-2 mpg Boosts Torque and Horsepower No Bungs, Requires Tuner Cat and DPF Delete Pipe