FLOWTECH equal length long tube headers are designed for 5.0L Mustang and Capri owners who demand maximum power and performance. These true equal length headers are built from select lengths of mandrel-bent 1 5/8 in. tubing, including FLOWTECHs exclusive Power Plenum collector. This header is also equipped with an oxygen sensor fitting that accepts the stock sensors.(Available in your choice of finishes.)