exhaust questions for 2.8 mu...

[haven]

seeing a lot of people on here with exhaust systems and im kinda getting addicted to the idea of it.. wouldnt mind a bit more flow from the turbo but at the same time i dont want it much louder than standard, ive had my share of str8 piped import cars,lol.
what sort of syste,s are people running and how much did it cost u? thinking 2.5 inch system is the way to go and just talk to the exhaust shop about the best muffler option...

any tips, recommendations would be great though