Cat-Back Exhaust for Focus Sedan – Including PZEV (Partial Zone Emissions Vehicle) Emissions. System features polished T-304 stainless steel tips. Borla Cat-Back & 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 Sound of Power respected by motoring enthusiasts everywhere.