German tuner G Power who specializes in turning BMW models into outrageously powered machines has announced that it is working on upgrading the limited edition BMW M3 GTS, for the ‘ultimate power output’.
The G Power BMW M3 GTS will feature the tuner’s SK II CS ‘Sporty Drive’ supercharger, along with a series of other mechanical tweaks, which will enable the German coupe to unleash 6XX HP. An exact figure was not specified but we hope they mean 699 HP 🙂
Also according to one of the tuner’s statements, "this modification the BMW M3 GTS can finally show the armada of Porsche 911 GT3 RS who’s the boss at the various clubsport racing events,"
The stock BMW M3 GTS uses a 4.8-litre V8 producing 450 horses, and can accelerate from 0 to 60 mph in 4.4 seconds. Top speed is 189 mph. 

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Source: G-Power