Originally Posted by Eturner
Get a tuner for it if you can. That way it will help you get all possible gains from any mods you make. But most mods you make to your exhaust should not ever require a tune.
+2 I agree with this whole heartedly.
You should tune for any and all upgrades to realize the maximum benefits of each and every one.
If the price doesn't make you faint, take a look at the AFM PMS
I like the list of tuning options it provides and the fact that you don't have to send a chip back to be retuned every time you make some changes.