For Ford 86-93 Mustang Chrome Exhaust Headers 5.0L 260-289 302-351 Fits Models: Small Block Fords 1986-1993 Mustang 5.0L or 260-289 302-351 chrome coated shorty type exhaust header Flange has a flat surface which can greatly improve gasket sealing. 2 1/2" collectors Thick 3/8" flanges which can resist warpage. Manufactured from 16 gauge. 1 5/8" OD diameter heavy duty tubing