289 hipo exhaust manifolds from a 64 or 65. That's not all you will need either. Depends on what engine you already have in it but you're looking at a bunch of "nickle and dime" things you'll need to get.
For years, JBA's Mid-length headers have been a favorite of classic Mustang builders and restorers. Praised for big power gains, easy installation, heavy-duty construction and no loss in ground clearance, these headers have no equal. The mid-length 1-5/8" primary tubes deliver excellent flow for high output engines. Extra thick 3/8" CNC laser-cut flanges on the head and collector prevent leaks caused by warping. These headers also feature JBA's patented Firecone® merge collector for improved exhaust scavenging and reduced turbulence in the exhaust system. Each kit includes high quality hardware and gaskets for a professional installation and starter tubes to mate to your existing system.
Large view JBA mid-length header.
JBA header features:
3/8" thick laser-cut single piece flanges
1-5/8" Mandrel-bent stainless steel primaries
Patented JBA Firecone® merge collector
JBA sealing dome connection with exhaust
Premium quality hardware and gaskets
Lots of ground clearance
Optional ceramic coating (thermal barrier)
50 state smog legal(for most applications)
Fits 1965-73 289, 302, 351W
1965 Mustang requires 1966-1970 motor mounts.