The 2011 BMW 5-Series is nowhere near a dealer showroom yet, but that isn’t stopping Racing Dynamics from dreaming on exactly what they’ll do to the big saloon once they get their wrenches on it. The tuner says it can pull at least 410 horsepower out of the car’s turbo 3.0-liter inline six. Of course, that’s just on the base 535i. The big-daddy 550i will get around 620 horsepower from a twin-turbo V8. Now we’re talking. Supposedly there will also be a new exhaust system onboard as well as custom locking differential. No word on how much all this goody will cost you. [Source: Carscoop]