The E46 M3. Need I say more? This is without a doubt one of the (if not *the*) most versatile cars available today. At home both in and out of the track, combined with styling which despite it's age, does not need to shame even if compared to the latest creations.
This one has been fitted with a Kelleners Sport modified version of the Bilstein PSS9 coilover setup. This, combined with adjustable H&R swaybars makes the car handle the way it should have come from the factory - smoothly, yet incredibly precisely. Furthermore, a Kelleners Sport exhaust has been added to bring the best out of the engine's remarkable soundtrack.
Later modifications will likely include a brake upgrade and possibly a short shifter. Other than that, I don't see any need for other changes at the moment.