These are estimates. These numbers are for parts only, and don't include installation fees on stuff that I didn't or couldn't do myself. This is an entire history, I kinda went with some entry level stuff to begin with but upgraded later. Items marked with an asterisk were either given to me or sold from a friend.
MAC cold air intake 190
BBK throttle body 200
C&L MAF* 100
K&N Air Filter* 0
Accufab Plenum 190
JBA headers 700
Magnaflow Xpipe 400
Magnaflow Catback 400
Steeda Tri-Ax 190
King Cobra clutch 180
Screamin Demon Coil packs 100
MAC underdrive pullies 90
Livewires 80
Full Steeda G Trac
suspension 2300
2003 Cobra front and rear brake upgrade kit with CD and slotted rotors in front 550
Aluminum driveshaft 200
Traction Lok 31 spline differential 200
Moser 31spline axles 250
FRPP 4.10 gears 190
2003 Mach 1 motor 3000
SLP Longtube headers 800
SLP shorty X-pipe with cats 250
24lb injectors/ADJ fuel pressure regulator with gauge 150
JBA Plug wires 70
Steeda Underdrive pullies* 0
JLT true cold air intake with stock cobra MAF* 0
New radiator 110
2001 Cobra Wheels* 400
Black 1998 GT taillights 120
1998 Cobra headlights 90
Black Vinyl inserts on bumber20
The grand total is $11,520. Again, these are estimates and I'm not sure what the price for some of the stuff was but everything is pretty much correct.