I guess the header/manifold is stock? It has what pretty much is indeed a header on it, and the front primary looks to be cracked all the way around. It's crack right where it's welded to the collector. I heard it's a well known problem but not sure where it normally happens. I have a good uncracked one that came with it. Should I go thru the trouble of replacing it, or have it welded up at a shop. Hard thing may be that it's close to the block.