cp-e 3" Downpipe for Ford Focus STcp e Focus ST downpipe includes a CNC lathed V Band flange for easy installation and stock compatibility. This downpipe is crafted from premium "bright annealed" 304 stainless steel and is mandrel bent throughout for less turbulent exhaust flow. cp e has included three O2 bungs to accommodate the two stock O2 sensors, and to give the ability to easily add a wideband sensor. cp e offers an optional high flowing catalytic converter that features a