Eurocharged in Round Rock can definitely handle any kid of aftermarket mods. The guy that owns the shop Adam is also an awesome dude.
The VF supercharged cars make 600-650hp at the wheels.
The AMS turbo kit which is $48,000 installed makes ~900hp at the wheels. Audi R8 Alpha 10 Twin Turbo Package (Installed) - AMSPerformance.com
But the supercharger does maintain that linear power band similar to a NA car. The turbo cars are stupid fast and probably too fast for most people for the street. They're popular with guys that like to make high speed pulls.