Take that thing to a chop saw and whack off the last bend going upwards towards the stock IC inlet location. Pick up a 2.5 stainless 45* bend and trim it up to meet the new FMIC and remaining pipe. You might be able to use a straight section. Mark it the way it needs to be welded, TIG it, slap on the coupler you have in the picture; done.
"possibly some slight modification."
