It actually takes a lot more skill to drive higher horsepower cars because you will need very good throttle control to prevent the car from over steering when exiting corners. If you look at some of the crazy built time attack S-chassis over in Japan lapping on courses like Tsukuba, they have about 500-650hp built SR20DETs, but they have fully adjustable suspension arms, custom built racing dampers, and a fully seam welded chassis with roll cages. They also run as much tire as they can. 295/30r18 front and rear is common, and they use s-tires such as Advan A048s so they can get as much grip as possible. A lot of work goes into aerodynamics too. They usually have front splitters and big rear wings. That's just to give you an idea of how much work goes into making a 500hp car controllable on the track.
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