Here's a listing of the mods on my track car.   Thankfully its no longer street driven.

Brakes
SS Lines
Racing Pads/Rotors
Ducting and Backing Plates (this summer)

Suspension
GC Coilovers
Koni Adjustable Shocks
IE Front Camber Plates
IE Rear Camber Adjustment Tabs
Delrin Offset Control Arm Bushings
Urethane Subframe Bushings
Urethane Trailing Arm Bushings
Urehane/Aluminum Rear Shock Mounts
Adjustable Front Sway Bar Links
M3 Rear Sway Bar
15" Konig
15" Team Dynamics

Engine/Intake/Exhaust
2.7L Super ETA Rebuild
Head Rebuild to M20/B25 Specifications
Ported, Polished, Shaved Head, w/Port Matched Intake
Bored Throttle Body
M30 AFM with Cold Filter
CatCam 296 Cam (head is pulled and waiting for this now)
MSDS Shorty Headers
Racing Dynamics Catless Center Section
Remus Exhaust
Alpina Chip
SMT6 (will install once the head is done)

Drivetrain
Lightened Stock Single Mass Flywheel
Sachs Power Clutch
Custom Short Shifter
Urethane Differential Bushing
4.10 M3 Rear Differential

Interior
Corbeau Racing Seats
5-Point Harnesses
3-Guage Pod in Center Vents (A/F Ratio, Fuel Pressure, Oil Pressure)
Custom Center Console Replacement (Tranny Temp, Oil Temp, Ignition, Wipers, Fan)
4-Point Roll-bar (will be 6-pt by the end of the track season)
Racing Steering Wheel with Adjustable Adapter
PLX Wideband O2 Module