The stock exhaust system doesn't sound too terrible, but Magnaflow has one of the best ways on the market to improve the exhaust tone of that Focus ST EcoBoost engine with this complete cat-back kit. This stainless steel exhaust system is an easy, bolt-on replacement for your factory cat-back that instantly adds an aggressive tone and extra power. The kit doesn't even require tuning or other modifications. Magnaflow's cat-back kit maintains the factory center-exit and does not require cutting or modifications to your rear valance.
