Assuming that yours is a USA-spec car, suffice to say here that getting a ROW tune opens up a very large number of potential exhaust options for you. Any one of which will be leagues above the restrictive OEM cats within the stock manifolds.
I am only about a month away now from wrapping up a top-to-bottom review and rework of my exhaust system. I'll end up with what I personally feel to be the "right" system for me and my usage of the car.
My intent is to start a new "What I Did" thread here once completed. But here's a sneak preview picture.
Thanks - DM