Here is the chart for a f1r drive hp. It seems like if a Procharger car can do 1000hp or 147mph a turbo car should be able to do 140hp better. Of course this just relates to the engine load. The rest of the driveline needs to be able to handle that extra power.
There is also the side load on the crank, at 1000hp I bet they have that belt pretty tight. Not sure how that effect the bearings.
