1979-93 5.0L Mustang, 1 5/8 full length, chrome headers This pair of BBK full length headers are a direct bolt-on to 1973-1993 Mustangs with five-speed transmissions only. They offer low end torque and peak power due to their full length design. Some of their features include 1 5/8 primary tubes, one piece laser cut flanges, and chrome finish. Add 15-20 more HP and great looks, too.