Underneath, the suspension is largely unchanged from the Competition package, featuring forged aluminum links and hub carriers. American customers, presumably more likely to use their M4s for commuting, get Pilot Super Sports as the standard tire. Behind the wheels, the CS features aluminum-hatted iron rotors with four piston front calipers and two pot rear units. The CS gets its very own unique front splitter crafted from carbon fiber, while it wears the rear diffuser from the GTS. On the decklid, this latest M4 sports a tidy Gurney-beflapped spoiler reminiscent of the unit found on the Corvette Z06.