http://i44.photobucket.com/albums/f6/kenimmp666/100_1280.jpg

This sleeve was inside the header pipe on my Eldorado. It looks very restrictive. No wonder the manifold was cracked so bad with all that heat being restricted inside of it.

Yeah, there is something strange there. I have seen cracked manifolds only very rarely. Will the header pipe bolt on without that reducer thing? I would definitely try to elimnate it somehow. I hope an Eldo owner can chime in.