Ok, here is the list as it stands so far:

The previous owner installed the following:

• Full Invidia exhaust, front to back, catless, headers and all. (I'm glad I didn't have to spend the money on this!)
• Cobb Accessport 3
• AEM short ram 
• Mishimoto radiator
• Mishimoto hoses
• Exedy clutch and flywheel
• ARP head studs
• I assume Kartboy shifter bushings at the bottom of the shift lever

My changes:

• Cobb short throw shifter
• Prothane shifter bushings
• Cobb 3 port EBCS
• Car Chemistry 3 disc exhaust insert and packing (THIS CAR IS LOUD!)
• Changed out the radio/speakers added a sub
• HID headlights
• Summit Racing Equipment LED fog lights
• Painted factory wheels
• Backup camera

Maintenance:

• Rebuilt all shifter internals including replacing the shifter pivot. 
• Changed all fluids 

Pending:

• Whiteline steering rack bushings
• Whiteline transmission mount insert
• Cobb pitch stop

So, as you can see, the previous owner really left me in great shape to start this project.