Good Idea. That's what I did and I never bothered changing it. However, I think one of the best and most cost effective options is headers with the magnaflow muffler (not cat-back). It sounds really good, Devak (The_curry_man) has that setup.
Make sure you don't get the O2 sensors mixed up between pre and post cat. Also make sure you get that engine block/mount ground installed tight.