The tuning potential of the 2011 BMW 5 Series is undeniable, what with the twin-turbocharged, direct-injected V8 in the 550i and the single, twin-scroll turbo (N55 inline-6) in the 535i. The Netherlands-based tuner Racing Dynamics has announced its primeval plans for the F10 5 Series, and big horsepower numbers top the list.

BMW rates the 2011 550i at 407 horsepower from the factory, and Racing Dynamic claims it can find 612 hp. The 535i will make 306 hp in stock form, but the tuner plans to get 405 hp out of it on its way to a 5.3-second 0-to-60-mph time — 0.7 second quicker than BMW's claim for the stock sedan.

Wisely, a limited-slip differential will be on offer as well, along with the expected big brake kit, lowered suspension and forged 21-inch wheels.

Bimmer Today (in German) via BMW Blog