It says $175k in the link above. Here are his mods with the amount invested at the end:
"2002 VIPER GTS TWIN TURBO
Graphite with Silver Stripes
Black Interior
Appx. 8,200 miles
Underground Racing Twin Turbo Package
Custom PT-76 Turbos with larger exhaust housing
Two Tial large billet blow off valves
Two Tial large billet wastegates
Custom front mount intercooler.
Custom 1200rwhp fuel system ( Before upgrade ).
AEM Computer
Fuel system upgraded to Pro Series Aeromotive pump and Pro Series billet 100 micron fuel filter
AEM low impedance injector driver
95lb injectors
Engine & Accessories
Custom 510 stroker
Offset ground crankshaft.
JE custom reverse dish pistons.
Eagle 4340 H-beam rods.
2000 series upgraded rod bolts.
Race prep bearings.
ARP head studs.
Billet main caps.
Crower camshaft
ATI balancer
Extrude hone intake
T&D Roller Rockers
Moly One-Piece Pushrods
Performance Lifters
Fox Lake larger chambered CC heads for low compression
McLeod twin disc clutch w/meeba lining
Fidanza Flywheel
Rear Differential
Mark Williams half shafts and custom spool
MW chrome molly drive shaft, billet yoke for rear differential and transmission
Brakes
Eradispeed Rotors
EBC Green Pads
StopTech Front and Rear Stainless Brake Lines
New Rear Viper Calipers modded to fit Purner wheels
Suspension
Billet Aluminum Adjustable Shocks
Body
GT2 Wing
3M Clear Bra (Deluxe Kit)
Carbon Fiber Cowl Cover
Chrome Gas Cap w/Sneaky Pete Logo
Tinted Windows
Interior
Teamtech 5 Point Harnesses(Driver & Passenger)
Seat Lowering Kit
B&M Short Throw Shifter
Carbon Fiber Dash Kit
Graphite Sneaky Pete Logo on Glovebox
BTR Roll Bar w/removable drivers door bar(never used). All painted Graphite.
Chrome Fire Extinguisher
Viper Mats
Gauges (Boost, Fuel, Air/Fuel Ratio)
Smart Tire System installed on car
Dynojet Wideband Commander
Greddy boost controller
Wheels & Tires
18" HRE 547's with Michelin Pilots. Tires and Rims have appx. 4k miles on them.
Cooling
New Fluidyne Aluminum radiator
Custom polished fan shroud with two SPAL fans
Custom Designed Airflow control to Radiator
Custom Intercooler
Exhaust
Custom Stainless Steel Coated Turbo Headers
New Custom Exhaust System to Cat-Back
B&B Cat-Back Exhaust
Extras
Front mount air filter system:
Remote oil relocation system adapter, Aeroquip lines, fittings, oil filter mount and refabrication of front radiator shroud for filter clearance
Thermal Spark Plug Shields
CAGS Eliminator
A-Pillar Gauge Pod
Steering Column Gauge Pod
Biondo Line Lock and Switch Kit (not installed)
Custom Embroidered California Car Cover (Black & Gray)
MSD Plug Wires
Clutch Pedal Lowering Kit
Brand New Embroidered Custom Hood Pad (Viper Twin Turbo w/Sneaky Pete Logo)
Brand New Custom Reflective Emblems (Viper GTS Twin Turbo)
Daimler Chrysler Extended Max Care Warranty till 2009 or 50k miles(transferable)
I have the original manual, window sticker, 2 key fobs, all receipts, dyno sheets, and much more that go with the car.
There are no issues whatsoever with this car. I have gone over the car and ensured everything is in proper working order. If I could say anything negative about the car it would only be that a new driver's side floor mat would look better. I would say that a matching trunk mat would also look good too. If you look in the trunk you can see some holes through the carpet where my old BTR NOS/Propane kit was professionally installed prior to the 510 stroker and Twin Turbos.
I have invested close to $175k in this car over the last few years."