Cat-Back(tm) Exhaust for Focus Sedan - Including PZEV (Partial Zone Emissions Vehicle) Emissions. System features polished T-304 stainless steel tips. Borla(r) Cat-Back(tm) & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power driving excitement fuel economy and the distinctive Borla(r) Sound of Power respected by motoring enthusiasts everywhere.