Originally Posted by Draman
This is a tuning thing moreso than a necessary downside of a turbo. Look at some of the tunes for the N54, they don't fall flat on their face as they reach high rpms. The downside is going to be redline, which will invariably be lower in a turbo car than an NA car.
It's a matter of what turbo they used, really.
Look at a well tuned Evo, it picks up power all the way to 7500-8000.