If the setup is being installed on an engine with stock compression ratio, the turbos being operated in their efficient range is very important. As a turbo spins past it's efficiency the air charge gets hotter. And hot air charge mixed with high compression like we have is a recipe for disaster without anything to cool the air down alot( a very efficient aftercooler, Nitrous, ALKY, or race gas). Detonaton due to a hot air charge can very easily melt a forged piston. An intercooler system on a twin turbo would only lead to more complexity in the design (there's not alot of space in our engine compartments) and nitrous or alcohol injection aren't very viable on a daily driven car...
Just a thought.
