Are you talking about the Remus or the Greddy (I think that you are talking about one of the two). I have a Group Buy going on right now for the Greddy Catback SP Exhaust, and if we can get 10+ people then we will be getting it for $478.50 shipped. That is the best performance exhaust for the Legend, and it's very quiet.
The Remus is also a good option, but will end up being more expensive most likely. It is just about personal preference.
Here is a pic of the Greddy: