I did a littl reserch and found out that this hedman header is no longer being produced.

http://www.bob2000.com/pinto.htm

Hedman Hedders, 562-921-0404, Cerritos, Ca. Hedman Hedders online catalog

2.0 Pinto: P/N 48020 This is a two-piece header, which requires welding of
some clips for bolts to connect the two pieces. Don't weld the two pieces
together directly! Since the 4 cylinder engine vibrates so much, welding the
two pieces together causes cracking of the pipes. I know this from
experience! Header exits under the floor of the car, pointing to the back