nope, but it will weld up to the stock cat...

Shoot. Anything will weld to anything. Does it have a collector?

My guesses:

A: Pacesetter

B: Homemade

C: Possibly a pre-74 header, or Mindtrain maybe?

I'm not qualified to play "Name that Tune" with you guys. But for the benifit of anyone who sees these, but doesnt know, the top header is of poor design because no attempt is made to keep the runners the same length.

Don't ever purchase Monza headers. Tempting though it may be, I've seen a picture on this site of the iside where the flange is joined to the runners. There is a serious power-killing restriction.

(I know you guy know all this. Its for the benifit of future 'looker-uppers' that don't.)

Pacesetter/Monza headers are very distinctive... one header pipe does NOT go over the other... they stay next to each other the whole way back. (So #1 header pipe is to the outside of the car and #2 is next to the transmission) The 1st-gen headers also have a separate bolt-on flange.

I've got a 12a race header of undetermined origin that uses a similar flange to A.

Kinda like it, doubt its being produced anymore though.