does it have any mods yet other than the exhaust ?
you can add about 20 hp to these for very little money.. make it the car it should have been from the factory. and faster than the official 'works' version..
get yourself on MiniTorque.. loads of great advice on tuning and any other aspect of owning and running these cars.
http://www.minitorque.com/forum/forum.php
I have a 2006 R53 with a few choice mods and it's a blast to drive IMO...