Originally Posted by Shamu

The V8s have weight penalties and some motor restrictions compared to 370z and the VQHR race motors the 370z use make well north of 400 WHP and 370z is lighter and more aero. The motors aren't like anything a stock 370 would run as they use 350z heads with race cams etc. 370z aren't as hard on tires and brakes as bigger cars either which helps in endurance series. 370z also gets better gas mileage than big v8 cars.