new2r33

Lads just chacing some advice on the best bits to use to get the power I am after. I have a 96 model R33 Gtst which is basically stock. It has a 3 inch exhaust from the turbo back, front mount intercooler, coilovers and boost guage. It has done 100k but is in very good condition and is booked in for a full 100k sevice. My ultimate goal is to destroy my brothers 350z on the track so I want it very responsive and driveable. I have $5000 to blow on it. I would appreciate your thoughts guys.........