Just look at what they are capable of doing:
GT1R Series 7 Package - 1900+bhp
Includes GT1R Stage 5 - 4.3L Long Block with CNC Ported Cylinder Heads and full Ferrea Valvetrain
GT1R Block Reinforcement Process
AMS Alpha 20 Turbo Kit
Driven Innovations Race Intercooler Kit with all piping
Shep Trans Stage 6 Package (PPG 1-6 gears, Dodson Pro Max Clutch, PPG Drop Gears, etc)
GT1R Transmission Braces
GT1R Stage 4 Fuel System with triple Walbro 485 pumps, ID2000 injectors, T1 rails, Weldon regulator, all wiring.
JMS FuelMAX voltage booster
EcuTek TCM Program
5 bar MAP sensors
Tial Q Blow Off Valves
T1 Spec R35 Transmission Fluid
GT1R Air/Oil Separators
Full Motec T1 Spec 12 Injector Package
Boost Logic 12 Injector Manifold/Rail Combo
All fluids, installation of all parts and full dyno tune on pump gas and race gas.
Drive Shaft Shop Pro Series Axles
ETS 4" Titanium Exhaust with custom GT1R 3.5 to 4" midpipe.
Yep, their builds go from mild to wild. Very nice wallpaper of a GTR that means business: