2002 Saab 9-5 2.3t linear

Tom, I want to do something nice for my baby, im thinking of replacing the turbo, maybe to get better performance from the car, or to replace the exhaust system, to get more of a low sound, its kind of stock sounding now, give me a call and let me know your thoughts, i trust your judgement, plus the car needs to go in for service in 2,000 miles. Thanks