Muffler exhaust and what brand cat is this?
 

I have flowmaster on my xj but not sure which one bought it already on and is this an aftermarket cat? It has alot of bends in the exhaust and I was looking to get most of it straight with 2.5 piping. But I feel like it cant? ,how can u make it straight will out it hiting anything.

Attachment 250181



Attachment 250182



Attachment 250183



Attachment 250184