The COBB Stainless Steel Turbo-Back Exhaust is constructed as a direct fit replacement for the stock unit, this system requires no modifications or "tweaking" of the exhaust components.
The COBB Stainless Steel Turbo-Back Exhaust is exactly what you're Fiesta ST is looking for. This system was designed and fabricated with the driver in mind. The high flow catalytic converter, muffler and dual laser etched tips offer optimal performance gains, tasteful looks and unparalleled durability while maintaining an exciting but livable exhaust tone.