Yes , the Steeda x-pipe is a nice piece . And yes 399 is reasonable . You will still need a cat-back or weld in some mufflers to your stock cat-back .

One other thing.....I see you have a 2004 . If you want to keep your warranty you will need to go with a "catted " x-pipe or h-pipe so you dont void your warranty . If you dont care about your warranty then you can get an o/r mid pipe .