I think the power figures for the road cars is realistic considering they represent '90s cars, but even though the power figures may be realistic the power delivery of the turbo cars is wrong. The way the turbos spools is more like a car with a huge turbo. I own a '90's 2.0l turbo which is almost identical to the xrt, it has the same power and torque at the same boost pressure but if I floor the throttle at 3,500rpm it hits full boost almost as fast as the throttle hits the floor and stays there until 6,500rpm and in higher gears it can hit full boost as low as 2,900 rpm. Try this on the xrt and you will see what I mean. Oh and the limiter is at nearly 8,000 rpm on my car incedently.
I personally would hate if they made lfs cars like modern cars because modern cars are bigger, heavier and then they put bigger and sometimes more powerful engines in them to make up for this, which imo is a step backwards.