One of the first modifications that should be done any serious tuner car is a high quality exhaust system. The Injen Technology SES performance catback or axleback exhaust systems for your Focus ST serve as a triple threat by adding performance, head-turning looks and a unique throaty exhaust tone. All Injen SES exhaust systems are mandrel bent and robotic TIG welded from high quality 304 stainless steel. Flanges are CNC cut to exacting vehicle specific tolerances, eliminating the chance of warpage and ensuring leak free performance that will last the life of your car. Injen SES exhaust systems for the Focus ST feature 60mm piping and are available with both a classic full stainless or burnt titanium oulet and all systems feature Injen's unique flared tip, a feature not available from any competing system. Unwrap an Injen SES exhaust and there will be no question that you have made the right choice.