I had a BES turbo timer on mine, ended up stuffing up everynow and then so i replaced it with a Apexi one. add me to MSN and i can tell you how to put in a new one using the wiring from the BES unit.
Before modifying it at all you should probably do a compression test on it to. might help tell you what condition the motor is. also see if it blows smoke, if it does might be turbo needing rebuild.
*If its all good the first thing is a Exhaust. i cant beleive how much better my car ran with a better exhaust. 2.5 or 3inch exhaust will do.
*Put in a front mount intercooler next. you can fit a decent size cooler in the front of a Starion. Put a BOV on at this stage if you want. but flutter from the turbo on a bigger exhaust sounds 10 times better.. well to me anyway.
*put in a boost controller of your choice although i run a E-boost2 you dont have to go to that extravagance. id say 10 psi will do on a stock motor. you can probably run a bit more but its better to play it safe.
For looks department buy the JD rear wing set (3 peices, 1 rear and 1 each side) go to this link to see what they look like on my JD
http://forums.austarion.com/viewtopic.php?t=6423
Also fit a front bar. curvy shapes dont really suit the Starion as its a fairly straight car. try a Coltspeed or JD replica front bar.
Wheels are a pain in the arse to find. some mags from R31 skylines fit but whatever you choose try get them trial fitted before handing over money to see if they will fit properly. and as said above Simmons mags on Starions looks awesome. :drool: