There was a recent post with a link to a youtube video of an xFire with full duals. I can't find the post, so try a search.
It sounded very good with no "tin" as in ricer.
http://youtube.com/watch?v=l2qOUa5iOnc
If you like this, you'll have to find the thread.
And this is a Magnaflow (Catback):
http://www.youtube.com/watch?v=N45kP...eature=related
Nice too!