exhaust manifold

yesterday i replace the last 2 pieces of my exhaust....i had already did the cat back and now it was time for the manifold and down pipe...after the install (ABOUT 3 hours) i took it out for a spin....wow i got lots of bottom end again...

What brand did you use?

What year is your XJ? The 91'+ High Output manifolds can be bought with an expansion section to help with when the manifold is cold or hot. This helps with the cracking problem.