The car came with a nice exhaust rear box, not sure what it is though.
So far I have
Replaced centre section of the exhaust (due to corrosion)
Tinted front indicators
Tinted rear lights
Front pads (EBC black)
N/S brake caliper
O/S driveshaft bracket (3 times)
Swan neck tow bar (was meant to be detachable! 
)
Avon ZZ3 front tyres
Installed Traffic-master clock
Removed Traffic-master clock
Kenwood CD H/U with bluetooth and iPod controls
Work in progress 
(since Christmas! 
)
Heated drivers seat
Electric rear windows
Sub and Amp
Planned
Groved discs all round
EBC yellow stuff all round
Goodrich braided hoses all round
(I've been waiting for the parts from CRM for 3 weeks! 
I'm considering cancelling the order 
)
Think my VIS bits may be on the way out
May do someday 
Induction
Less restrictive exhaust
Uprated suspension
(sorry, got a bit carried away enhancing this post)