By the way if it is the flex joint you are referring to they are like $10 if that at Midas or somewhere like that.
When I put my JDM motor in I got the exhaust manifold which really isn't a manifold on the JDM H22, it's more like a 2 piece header. Anyhow when the motor was yanked from the donor in Japan rather than cutting after the flex joint and sending that with the downpipe, they just cut right through the flex joint very close to the end of the down pipe and the o2 sensor. Because it was so close and there was not much material to work with, Midas charged me like $200 to clean it up and weld on a new flex joint then cut the cat out and move it back to line up with the new flex joint. All in all it was $200 but the actual flex joint was only $10... the rest was for labor because they had to do a lot of cutting, relocating, and welding.