But if you are street driving, you shouldn't be needing to brake from a higher speed for corners now. For racing, it makes sense that more power needs better brakes, because you will accelerate to a higher speed between corners. On the street, you'll only be accelerating more quickly up to the same speeds that you would have accelerated up to without the supercharger (unless you treat the streets like a race track, disregarding speed limits).

The brakes only care how quickly you need to slow down from what speed. It doesn't matter how quickly you accelerated up to that speed.