Throw in the super duper brakes, probably super light wheels, space framing, cage, proper race seats, harness, heaps of engine work, probably fully stripped out inside as a proper racecar, possibly all sorts of telemetry inside the car, special fuel pump, just for a start. Proper racing isn't cheap.
+1 - also remember the races that its being targeted for. This is reliable power. Will run for a long time with no problems flat out. Its very easy to bolt a pair of turbos to the car to get the same power, but to extract it N/A, thats good power