Oh boy. I'm scared to say.
Mazdaspeed Exhaust Manifold $200 plus one of my co-workers to weld the cracks the guy didn't tell me about.
GT2560R Turbocharger $225
turbolife Front Mount Intercooler $650
HKS SSQV Blow-off Valve $150
DocB Customized Oil Pump $150
DocB External Oil Pressure Relief Valve $150
eBay Oil Filter Relocate Kit $50
Flashed MSP ECU #9 .... Thanks to SpicyorangeMSP $150
Air Conditioning Delete FREE! but alot of complaining from my wife.
AWR Front and Rear Motormounts w/ Side Inserts $100 plus complaints like above
Drivetrain
Clutch Masters FX400 6 Puck Sprung Kit $600
B&M Short Throw Shifter $125
Interior
Custom Dual gauge cluster surround $200
Autometer ES Series Boost/Vac Gauge $185
Autometer ES Series Oil Pressure Gauge $185
Exterior
3M Headlight Restoration $30
Racinghart MP3 Rims $400
Suspension
Tokico Illumina Struts $1150
Espelir "Active Super Down" Springs $350
Still Requiring Installation
ForceFed Column Gauge pod $50
Mazdaspeed Limited-slip Differential $100
Mazda OEM Intake Manifold (VTCS/VICS Delete) FREE less the time I've got into it
Mazda OEM Polished Valve Cover FREE but like above
Pope 3" DownPipe $300
Sleeper GT3071R FREE less the time I have into it
Microtech LT10S $1000
Stock block that STILL needs to be built $150 for a full long block, oil pan to valve cover from the scrap yard.
So about 6650 give or take. That's what's in the car less all shipping costs and time it took me to install. The car was $6200 in december of 2008.
Granted these are all rough estimates, and do not cover the need for more tools, stuff like bolts and wiring, the $1500 I paid for the laptop to eventually tune the car with.... The list goes on.