1986-93 5.0L Mustang, 1 5/8 shorty, unequal length headers These BBK unequal length shortie headers are constructed of 14 gauge mandrel bent tubing with 3/8 in. thick die-stamped individual type flanges. They feature 1 5/8 inch primary tubes and come with a ceramic coated finish. Add 8-15 more HP and great looks, too!