4-1 1 piece design Shorty Chrome Racing Header Shorty Header utilizes latest exhaust flow design to improve exhaust flow. The 4-1 shorty design dramatically reduces engine back pressure caused by power-robbing the exhaust manifold and increases both horsepower and torque. Using computer-controlled mandrel benders, 16-gauge steel tubing, thick steel flanges and quality manufacturing techniques to ensure a proper seal and fitment with the Toyota engine. This racing 4-1 header is a perfect combination of performance superiority and installation ease. Mandrel bend CNC flange Utilizes Factory O2 Sensor Large pores and collector $190.00 Toyota Celica GT 00 and up Toyota Corolla CE/LE 03-05