That'll officially turn it into a more enticing bet against the AMG C63 S, Alfa Romeo Giulia Quadrifoglio, and Audi RS3. It’s not like BMW had to do much to migrate the hardware over, but we’re glad it took the time and the effort to do so. Under the hood of the M3 CS will be the same 3.0-liter twin-turbocharged inline-six powerplant making 460 horsepower. Unlike , the M3 sedan has no GTS variant, so this engine transplant would effectively make the M3 CS the most powerful M3 of all time. Of course, the rest of the hardware will make the migration to from coupe to sedan as well. Be on the lookout for the telltale CS signs like a carbon fiber hood, OLED taillights, and a deckled spoiler and rear diffuser both made of the carbon fiber good stuff.