Yeah looks like you've got quite a few goodies that you dont even know what they are for. Anyway like others have said make sure its got 3" turbo back zorst, if its just 3" cat back then I would personally upgrade to split dump pipes plus highflow cat. Then you are ready for a tune. My guess is that you can make about 250rwkw+ but obviously depending on the tune, usually there are surprises/problems that can only be seen when having it tuned.