Flowmaster offers an excellent, high quality exhaust system for your 2013-2017 Focus ST with their American Thunder Cat-Back Exhaust. By reducing back pressure for a free flowing exhaust, this cat-back produces more power and torque to the wheels. The exhaust note can best be described as moderate to aggressive in volume without being too 'racey'.
Constructed from durable 2.25" diameter mandrel bent stainless steel tubing for its corrosion resistant properties, this Flowmaster American Thunder Cat-Back features a tuned resonator style muffler and finishes with gorgeous polished tips that exit in the factory location.
Fits 2013-2017 Focus ST