HP is a function of torque. It is a little difficult to do the math since they decided to use mph instead of RPM, but I will walk you through this anyway. Lets take a sample of the HP/TQ numbers at any section of the graph. I pick 108mph. At this point, we have the HP curve reaching 1500whp. The tq reading is 1260. When we do the math, that equates to 6250rpm. Lets move to another point on the graph, say 150mph. At this point we have 1200ft/lb, and I calculate the car to be at 8680rpm. That would equal 1983whp. Yes, *W*hp, not CRANK hp. Let me know if this math stuff is over your head.
BTW, thats the ugliest fucking car I've ever seen.