Dynatech Engine Swap Headers are for use in 1979-2004 Mustangs when performing an engine swap using an AJE tubular k-member, engine mounts and lower control arms. Using the latest design technology, Dynatech created these headers to fit a wide variety of engine combinations utilizing standard heads, factory starters and the factory steering shaft on 1994-2004 Mustangs (1979-1993 Mustangs require a Flaming River low-profile steering shaft assembly). These headers can be easily connected to a complete muffler system or converted to attach slip on Merge Collectors for all out race applications.