Twin turbo or supercharger?

Dinan offers an engine program/tune with cold air intake and exhaust system but it doesn't yield any significant advantage over stock.

ESS recently announced a supercharger system for the N62 motor. It's been in the works for some time but not sure if they've actually developed on a test E53 vehicle, like Dinan did with the 4.6iS. Do a search on this forum for ESS supercharger...Just be aware of the major parts/labor costs involved.