Exhaust manifold for Focus MK1 1.8 and 2l Zetec E engines. "The Mac Performance direct replacement header features CNC Laser cut 3/8 inch thick flanges. The mandrel bent primary tubes are 1 and 5/8 inch diameter. Collector size is 2.5 inches. This header is Heli-Arc welded and has a ceramic coating to keep it looking nice. Comes with a 3 year, 50,000 mile warranty. Mac has revised this popular shorty header! Details below! This header now includes the "L-shaped" brace between the head flange and the catalytic converter flange to reduce flex in this area! "