Manic_Mechanic
Turbocharged
The cat deletes are hard to find, probably can't, except that Dave Platt makes them ($365) and sells them along with other exhaust stuff. He's in the UK and you can find him on e-bay. Whatever you do to upgrade the exhaust has to involve getting rid of the cat. A full CES or Reband exhaust will cost a lot more than Platt's cat delete and then you have to find a tune for them too.
How about Jardines for $500