How many horespowers does the fastest car have?

How many horespowers does the fastest car have?
The Barabus TKR, maxes out at 270 mph stock, with 1005 horsepower. The car with the most horsepower was the Campbell-Railton Blue bird with a 36.7 litre supercharged Rolls Royce R v-12 with 2,300 hp.